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Vulnerability record · CVE-2022-24801 · published 4 April 2022

CVE-2022-24801: Twisted http request smuggling vulnerability

Twisted · Twisted

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.

8.1 CVSS 3.1 High EPSS 2.8% · top 14.1% CWE-444 · HTTP request smuggling
8.1CVSS 3.1 base score, v2 6.8
2.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/twisted/twisted/commit/592217e951363d60e9cd99c5bbfd23d4615043ac PatchThird Party Advisory
https://github.com/twisted/twisted/releases/tag/twisted-22.4.0rc1 Release NotesThird Party Advisory
https://github.com/twisted/twisted/security/advisories/GHSA-c2jg-hw38-jrqq Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00003.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRY
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHP
https://www.oracle.com/security-alerts/cpujul2022.html PatchThird Party Advisory
https://github.com/twisted/twisted/commit/592217e951363d60e9cd99c5bbfd23d4615043ac PatchThird Party Advisory
https://github.com/twisted/twisted/releases/tag/twisted-22.4.0rc1 Release NotesThird Party Advisory
https://github.com/twisted/twisted/security/advisories/GHSA-c2jg-hw38-jrqq Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00003.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRY
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHP
https://www.oracle.com/security-alerts/cpujul2022.html PatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2022-24801), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.