CVE catalog
CVE-2026-115877
twisted: CVE-2026-115877
- Severity
- Medium · CVSS 5.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.26% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | twisted | sid | 26.4.0-6 | vulnerable |
| Debian | twisted | forky | 26.4.0-6 | vulnerable |
| Debian | twisted | trixie | 24.11.0-1 | vulnerable |
| Debian | twisted | bookworm | 22.4.0-4+deb12u1 | vulnerable |
| Debian | twisted | bookworm-security | 22.4.0-4+deb12u1 | vulnerable |
| Ubuntu | twisted | pro | 16.6.0-2ubuntu3 | vulnerable |
| Ubuntu | twisted | pro | 17.9.0-1 | vulnerable |
| Ubuntu | twisted | pro | 17.9.0-2 | vulnerable |
| Ubuntu | twisted | pro | 17.9.0-2ubuntu0.1 | vulnerable |
| Ubuntu | twisted | pro | 17.9.0-2ubuntu0.3 | vulnerable |
| Ubuntu | twisted | pro | 17.9.0-2ubuntu0.3+esm1 | vulnerable |
| Ubuntu | twisted | pro | 17.9.0-2ubuntu0.3+esm2 | vulnerable |
| Ubuntu | twisted | 20.04 | 18.9.0-3ubuntu1 | vulnerable |
| Ubuntu | twisted | 20.04 | 18.9.0-5 | vulnerable |
| Ubuntu | twisted | 20.04 | 18.9.0-6 | vulnerable |
| Ubuntu | twisted | 20.04 | 18.9.0-6build1 | vulnerable |
| Ubuntu | twisted | 20.04 | 18.9.0-6ubuntu1 | vulnerable |
| Ubuntu | twisted | 20.04 | 18.9.0-8 | vulnerable |
| Ubuntu | twisted | 20.04 | 18.9.0-11 | vulnerable |
| Ubuntu | twisted | 20.04 | 18.9.0-11ubuntu0.20.04.1 | vulnerable |
| Ubuntu | twisted | 20.04 | 18.9.0-11ubuntu0.20.04.2 | vulnerable |
| Ubuntu | twisted | 20.04 | 18.9.0-11ubuntu0.20.04.3 | vulnerable |
| Ubuntu | twisted | 20.04 | 18.9.0-11ubuntu0.20.04.4 | vulnerable |
| Ubuntu | twisted | 20.04 | 18.9.0-11ubuntu0.20.04.5 | vulnerable |
| Ubuntu | twisted | 22.04 | 20.3.0-7ubuntu1 | vulnerable |
| Ubuntu | twisted | 22.04 | 20.3.0-7ubuntu3 | vulnerable |
| Ubuntu | twisted | 22.04 | 22.1.0-2ubuntu2 | vulnerable |
| Ubuntu | twisted | 22.04 | 22.1.0-2ubuntu2.1 | vulnerable |
| Ubuntu | twisted | 22.04 | 22.1.0-2ubuntu2.3 | vulnerable |
| Ubuntu | twisted | 22.04 | 22.1.0-2ubuntu2.4 | vulnerable |
| Ubuntu | twisted | 22.04 | 22.1.0-2ubuntu2.5 | vulnerable |
| Ubuntu | twisted | 22.04 | 22.1.0-2ubuntu2.6 | vulnerable |
| Ubuntu | twisted | 22.04 | 22.1.0-2ubuntu2.7 | vulnerable |
| Ubuntu | twisted | 24.04 | 22.4.0-4 | vulnerable |
| Ubuntu | twisted | 24.04 | 22.4.0-4ubuntu1 | vulnerable |
| Ubuntu | twisted | 24.04 | 23.10.0-2 | vulnerable |
| Ubuntu | twisted | 24.04 | 24.3.0-1 | vulnerable |
| Ubuntu | twisted | 24.04 | 24.3.0-1ubuntu0.1 | vulnerable |
| Ubuntu | twisted | 24.04 | 24.3.0-1ubuntu0.2 | vulnerable |
| Ubuntu | twisted | 26.10 | 25.5.0-5 | vulnerable |
| Ubuntu | twisted | 26.10 | 26.4.0-4 | vulnerable |
| Ubuntu | twisted | 26.04 | 24.11.0-1 | vulnerable |
| Ubuntu | twisted | 26.04 | 25.5.0-4 | vulnerable |
| Ubuntu | twisted | 26.04 | 25.5.0-5 | vulnerable |
| Ubuntu | twisted | 26.04 | 25.5.0-5ubuntu0.1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | twisted | source | sid | (unfixed) | not yet assigned | Not reported | [1151938] |
| Debian | twisted | source | forky | (unfixed) | not yet assigned | Not reported | [1151938] |
| Debian | twisted | source | trixie | (unfixed) | not yet assigned | Not reported | [1151938] |
| Debian | twisted | source | bookworm | (unfixed) | not yet assigned | Not reported | [1151938] |
Notes
[trixie] twisted: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-twisted]Affected
Source package: [twisted]
Details (4)
22.4.0-4+deb12u1· all · bookwormAffected
dsa · twisted · debian · bookworm; dsa · twisted · debian · 12
22.4.0-4+deb12u1· all · bookwormAffected
dsa · twisted · debian · bookworm; dsa · twisted · debian · 12
22.4.0-4+deb12u1· all · bookworm-securityAffected
dsa · twisted · debian · bookworm; dsa · twisted · debian · 12
22.4.0-4+deb12u1· all · bookworm-securityAffected
dsa · twisted · debian · bookworm; dsa · twisted · debian · 12
- [twisted-doc]Affected
Source package: [twisted]
Details (4)
22.4.0-4+deb12u1· all · bookwormAffected
dsa · twisted · debian · bookworm; dsa · twisted · debian · 12
22.4.0-4+deb12u1· all · bookwormAffected
dsa · twisted · debian · bookworm; dsa · twisted · debian · 12
22.4.0-4+deb12u1· all · bookworm-securityAffected
dsa · twisted · debian · bookworm; dsa · twisted · debian · 12
22.4.0-4+deb12u1· all · bookworm-securityAffected
dsa · twisted · debian · bookworm; dsa · twisted · debian · 12
[Debian 13 (Trixie)]
- [python3-twisted]Affected
Source package: [twisted]
Details (2)
24.11.0-1· all · trixieAffected
dsa · twisted · debian · 13
24.11.0-1· all · trixieAffected
dsa · twisted · debian · 13
- [twisted-doc]Affected
Source package: [twisted]
Details (2)
24.11.0-1· all · trixieAffected
dsa · twisted · debian · 13
24.11.0-1· all · trixieAffected
dsa · twisted · debian · 13
Observed:
References
- [https://github.com/twisted/twisted/commit/022b6f7feb5980166c71f54e2c0d8f4f21ff6e1a]
- [https://github.com/twisted/twisted/commit/1616f702d36eda8990a5a5b22ad70fab140a7eb1]
- [https://github.com/twisted/twisted/pull/12755]
- [https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1]
- [https://github.com/twisted/twisted/security/advisories/GHSA-q7qq-6mhp-9rc4]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-115877]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-115877]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-115877]
- [https://security-tracker.debian.org/tracker/CVE-2026-115877]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115877.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]