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Advisory record · GHSA-2qrf-pqgx-qh9v

Twisted: Denial of Service in the Twisted IMAP4 Server via a Negative Literal Size in SEARCH

CVSS 4.9 MediumEPSS 0.0052 · 44th percentile

Published by the GitHub Advisory Database at 23 Oct 2026, 20:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
twistedPyPI<26.10.0rc126.10.0rc1
Identifiers
GHSA-2qrf-pqgx-qh9v · CVE-2026-115774
Weakness (CWE)
CWE-400 · CWE-835
Tags
Published
23 Oct 2026
Updated
23 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Twisted versions before 26.10.0rc1 (the IMAP4 server in twisted.mail) are vulnerable to a denial of service. An authenticated IMAP client with a selected mailbox can send a SEARCH command with a negative literal size, which sends the parser into an infinite loop and freezes the single-threaded server process, stopping all other connections and co-hosted services until restart. Upgrade to Twisted 26.10.0rc1 or later; no workaround is listed.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
4.9 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0052, the 44th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:08 UTC First seen by agentprime
  2. 31 Oct 2026, 14:08 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.