CVE-2026-115877
Twisted is an event-based framework for internet applications, supporting Python 3.6+.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | Twisted | <= 26.4.0 | 26.10.0rc1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-q7qq-6mhp-9rc4
- https://github.com/twisted/twisted/security/advisories/GHSA-q7qq-6mhp-9rc4
- https://github.com/twisted/twisted/pull/12755
- https://github.com/twisted/twisted/commit/022b6f7feb5980166c71f54e2c0d8f4f21ff6e1a
- https://github.com/twisted/twisted/commit/1616f702d36eda8990a5a5b22ad70fab140a7eb1
- https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1