CVE-2026-115877
mediumTwisted is an event-based framework for internet applications, supporting Python 3.6+.
Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.web.http.HTTPChannel.headerReceived rejects a NUL byte in an HTTP header value but accepts a bare carriage return or bare line feed. Because Twisted splits header lines only on CRLF, a hidden Content-Length header can remain folded into another value while a lenient front end treats the bare character as a line terminator. The resulting framing disagreement can smuggle a following request past front-end access controls, poison a shared connection or cache, and expose a later client to the wrong response. This issue is an incomplete-fix residual of earlier Twisted request-smuggling protections. This issue is fixed in version 26.10.0rc1.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/twisted/twisted/commit/022b6f7feb5980166c71f54e2c0d8f4f21ff6e1a security-advisories@github.com
- https://github.com/twisted/twisted/commit/1616f702d36eda8990a5a5b22ad70fab140a7eb1 security-advisories@github.com
- https://github.com/twisted/twisted/pull/12755 security-advisories@github.com
- https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1 security-advisories@github.com
- https://github.com/twisted/twisted/security/advisories/GHSA-q7qq-6mhp-9rc4 security-advisories@github.com
- https://github.com/twisted/twisted/security/advisories/GHSA-q7qq-6mhp-9rc4 134c704f-9b21-4f2e-91b3-4a467353bcc0