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  4. CVE 2026 115877 twisted http request smuggling in twistedweb via
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Back to active CVEs
Medium ยท CVSS 5.4CVE-2026-115877GHSA-Q7QQ-6MHP-9RC4

Twisted: HTTP Request Smuggling in twisted.web via a Bare CR or LF in a Header ValueCVE-2026-115877

Answer in brief

CVE-2026-115877 records a Medium severity (CVSS 5.4) vulnerability in Twisted: HTTP Request Smuggling in twisted.web via a Bare CR or LF in a Header Value. The current sources do not mark it as known exploited. The current feed maps twisted/twisted (generic), Twisted (pip), twisted (pypi). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 23, 2026Updated Oct 23, 2026Source checked Oct 23, 2026First seen by HOL Oct 23, 2026Material review Oct 23, 2026
Upstream Advisory

Key facts

Risk
Medium ยท CVSS 5.4
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 5.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps twisted/twisted (generic), Twisted (pip), twisted (pypi). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
twisted/twistedgeneric<26.10.0rc126.10.0rc1
Twistedpip<=26.4.026.10.0rc1
twistedpypi>=0 <26.10.0rc126.10.0rc1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for twisted/twisted, Twisted, twisted.
  2. 2Review the reported fix. Update twisted/twisted to 26.10.0rc1; Twisted to 26.10.0rc1; twisted to 26.10.0rc1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 23, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Twisted: Denial of Service in the Twisted IMAP4 Server via a Negative Literal Size in SEARCHSame twisted/twisted package
  • Twisted: Unauthenticated Remote Denial of Service in the Twisted words domish XML Element Stream via an Unbounded Element TreeSame twisted/twisted package
  • Twisted: Unauthenticated Remote Denial of Service in the Twisted IRC Server via an Unbounded Line BufferSame twisted/twisted package
  • Twisted: Unauthenticated Remote Denial of Service in the Twisted conch Telnet Transport via an Unbounded Subnegotiation BufferSame twisted/twisted package
  • Twisted: DNS Response Spoofing in twisted.names Due to Missing Source Address ValidationSame twisted/twisted package
  • pypdf: Possible long runtimes for repeated references to the same missing objectSame pip ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-444
Source
CVE List V5
Source checked
Oct 23, 2026
References
7 linked sources
Open source record