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Advisory record · GHSA-8pqf-f4m5-798g

Twisted: IMAP wildcardToRegexp() ReDoS

CVSS 4.3 MediumEPSS 0.0042 · 36th percentile

Published by the GitHub Advisory Database at 7 Oct 2026, 16:18 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
twistedPyPI<=26.4.0No fixed version yet
Identifiers
GHSA-8pqf-f4m5-798g · CVE-2026-106454 · PYSEC-2026-4304
Weakness (CWE)
CWE-1333
Tags
Published
7 Oct 2026
Updated
15 Oct 2026

Machine-written summary

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

Twisted versions up to and including 26.4.0 are affected by a regular expression denial-of-service flaw in the IMAP server's handling of LIST and LSUB wildcard patterns. An authenticated IMAP client can send a pattern containing regex syntax that causes catastrophic backtracking, blocking the single-threaded server for a long period and stalling all connections. The source lists no fixed version; the source suggests escaping non-wildcard characters before compiling the pattern as a mitigation.

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
4.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0042, the 36th percentile, on 8 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.