CVE-2022-24801

Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to version 22.4.0rc1, the Twisted Web HTTP 1.1 server, located in the `twisted.web.http` module, parsed several HTTP request constructs more leniently than permitted by RFC 7230. This non-conformant parsing can lead to desync if requests pass through multiple HTTP parsers, potentially resulting in HTTP request smuggling. Users who may be affected use Twisted Web's HTTP 1.1 server and/or proxy and also pass requests through a different HTTP server and/or proxy. The Twisted Web client is not affected. The HTTP 2.0 server uses a different parser, so it is not affected. The issue has been addressed in Twisted 22.4.0rc1. Two workarounds are available: Ensure any vulnerabilities in upstream proxies have been addressed, such as by upgrading them; or filter malformed requests by other means, such as configuration of an upstream proxy.

• CWE-444
• CWE-444

• https://github.com/twisted/twisted/commit/592217e951363d60e9cd99c5bbfd23d4615043acPatch, Third Party Advisory
• https://github.com/twisted/twisted/releases/tag/twisted-22.4.0rc1Release Notes, Third Party Advisory
• https://github.com/twisted/twisted/security/advisories/GHSA-c2jg-hw38-jrqqThird Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/05/msg00003.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRYLFBD2YW5K/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHPHGGNKMAG6/
• https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
• https://github.com/twisted/twisted/commit/592217e951363d60e9cd99c5bbfd23d4615043acPatch, Third Party Advisory
• https://github.com/twisted/twisted/releases/tag/twisted-22.4.0rc1Release Notes, Third Party Advisory
• https://github.com/twisted/twisted/security/advisories/GHSA-c2jg-hw38-jrqqThird Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/05/msg00003.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRYLFBD2YW5K/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHPHGGNKMAG6/
• https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory

Published

Apr 4, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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