CVE catalog
CVE-2026-115774
twisted: CVE-2026-115774
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.43% · Oct 27, 2026
Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.mail.imap4.IMAP4Server reaches twisted.mail.imap4.parseNestedParens with a negative literal size in an authenticated SEARCH command after the client enters the selected mailbox state. The negative size moves the parser cursor below zero, and Python's negative indexing prevents the synchronous scanning loop from terminating. The loop freezes the single-threaded reactor, stopping other IMAP connections and any SMTP or POP3 services hosted in the same process until restart. 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/3d125548bcbe955007cb97f480bb699a5e074741]
- [https://github.com/twisted/twisted/pull/12764]
- [https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1]
- [https://github.com/twisted/twisted/security/advisories/GHSA-2qrf-pqgx-qh9v]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-115774]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-115774]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-115774]
- [https://security-tracker.debian.org/tracker/CVE-2026-115774]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115774.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]