CVE catalog
CVE-2026-115778
twisted: CVE-2026-115778
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.54% · Oct 25, 2026
Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.conch.telnet.Telnet.dataReceived appends every byte received after IAC SB to a persistent subnegotiation buffer until IAC SE is received, without applying a maximum length. Telnet option negotiation occurs before authentication, so an unauthenticated peer can omit the terminator and continuously grow the buffer. The resulting memory exhaustion can terminate the process and every service it hosts. 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/073ba878c6c07d569cb61abc5ae76d46eff1b529]
- [https://github.com/twisted/twisted/commit/5d91cc66a3591faba758a80a1479e0103602facc]
- [https://github.com/twisted/twisted/pull/12750]
- [https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1]
- [https://github.com/twisted/twisted/security/advisories/GHSA-cwm5-jh59-mwxr]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-115778]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-115778]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-115778]
- [https://security-tracker.debian.org/tracker/CVE-2026-115778]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115778.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]