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vulnerable to HTTP Response splitting from assigning header value iterator\n### Impact\nWhen calling `DefaultHttpHeaders.set` with an _iterator_ of values (as opposed to a single given value), header value validation was not performed, allowing malicious header values in the iterator to perform [HTTP Response Splitting](https://owasp.org/www-community/attacks/HTTP_Response_Splitting).\n\n### Patches\nThe necessary validation was added in Netty 4.1.86.Final.\n\n### Workarounds\nIntegrators can work around the issue by changing the `DefaultHttpHeaders.set(CharSequence, Iterator<?>)` call, into a `remove()` call, and call `add()` in a loop over the iterator of values.\n\n### References\n[HTTP Response Splitting](https://owasp.org/www-community/attacks/HTTP_Response_Splitting)\n[CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers](https://cwe.mitre.org/data/definitions/113.html)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [[example link to repo](https://github.com/netty/netty)](https://github.com/netty/netty)\n* Email us at [netty-security@googlegroups.com](mailto:netty-security@googlegroups.com)","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2022-41915","reference_id":"","reference_type":"","scores":[{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66837","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66812","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66846","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66878","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66892","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66872","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66859","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.6681","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00522","scoring_system":"epss","scoring_elements":"0.66921","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00555","scoring_system":"epss","scoring_elements":"0.68179","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00555","scoring_system":"epss","scoring_elements":"0.68128","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00555","scoring_system":"epss","scoring_elements":"0.68165","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00555","scoring_system":"epss","scoring_elements":"0.68123","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00555","scoring_system":"epss","scoring_elements":"0.6814","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00555","scoring_system":"epss","scoring_elements":"0.68174","published_at":"2026-04-26T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2022-41915"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37136","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37136"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37137","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37137"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43797","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43797"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41881","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41881"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41915","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41915"},{"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":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/netty/netty"},{"reference_url":"https://github.com/netty/netty/commit/c37c637f096e7be3dffd36edee3455c8e90cb1b0","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/netty/netty/commit/c37c637f096e7be3dffd36edee3455c8e90cb1b0"},{"reference_url":"https://github.com/netty/netty/commit/fe18adff1c2b333acb135ab779a3b9ba3295a1c4","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/netty/netty/commit/fe18adff1c2b333acb135ab779a3b9ba3295a1c4"},{"reference_url":"https://github.com/netty/netty/issues/13084","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/netty/netty/issues/13084"},{"reference_url":"https://github.com/netty/netty/pull/12760","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N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Stack Exhaustion DoS\n### Impact\nA StackOverflowError can be raised when parsing a malformed crafted message due to an infinite recursion.\n\n### Patches\nUsers should upgrade to 4.1.86.Final.\n\n### Workarounds\nThere is no workaround, except using a custom HaProxyMessageDecoder.\n\n### References\nWhen parsing a TLV with type = PP2_TYPE_SSL, the value can be again a TLV with type = PP2_TYPE_SSL and so on.\nThe only limitation of the recursion is that the TLV length cannot be bigger than 0xffff because it is encoded in an unsigned short type.\nProviding a TLV with a nesting level that is large enough will lead to raising of a StackOverflowError.\nThe StackOverflowError will be caught if HAProxyMessageDecoder is used as part of Netty’s ChannelPipeline, but using it directly without the ChannelPipeline will lead to a thrown exception / crash.\n\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in 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