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CVE-2026-115877medium5.4

Twisted: HTTP Request Smuggling in twisted.web via a Bare CR or LF in a Header Value

Impact

Twisted web framework versions prior to 26.10.0rc1 are vulnerable to HTTP request smuggling via a bare CR or LF in a header value. This can lead to bypassing access controls, poisoning connections or caches, and exposing clients to incorrect responses.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

twisted · GitHub_M

twisted

1 range
GitHub_M version evidence

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affected

< 26.10.0rc1

unaffected

unknown

Other versions: unknown

Original source description

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.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-115877

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cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-444 ↗

CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

GitHub_M

Related →
Contributing organizations · 2
GitHub_M

Assigning organization

2026-10-23
CISA-ADP

Additional data publisher

2026-10-29

What changed

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References

5 sources
github.com/twisted/twisted/security/advisories/GHSA-q7qq-6mhp-9rc4
exploitGitHub_M · CISA-ADP
github.com/twisted/twisted/pull/12755
PatchGitHub_M
github.com/twisted/twisted/commit/022b6f7feb5980166c71f54e2c0d8f4f21ff6e1a
PatchGitHub_M
github.com/twisted/twisted/commit/1616f702d36eda8990a5a5b22ad70fab140a7eb1
PatchGitHub_M
github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1
Release notesGitHub_M