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CVE-2026-115877

5.4 medium Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 4

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-29 14:23
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-26 14:05
  3. StatusReceived → PublishedNVD modified 2026-10-23 20:25
  4. First seenCVSS 5.4NVD modified 2026-10-23 21:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 5