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Advisory record · GHSA-ffpj-xv5c-p3gw

Open WebUI: ReDoS in skill-mention regexes causes whole-instance DoS on default config

CVSS 6.5 MediumEPSS 0.0057 · 47th percentile

Published by the GitHub Advisory Database at 24 Jul 2026, 16:55 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
open-webuiPyPI>=0.9.2, <0.10.00.10.0
Identifiers
GHSA-ffpj-xv5c-p3gw · CVE-2026-59220 · PYSEC-2026-3596
Weakness (CWE)
CWE-1333
Tags
Published
24 Jul 2026
Updated
4 Aug 2026

Machine-written summary

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

Open WebUI versions 0.9.2 up to but not including 0.10.0 are vulnerable to a regular expression denial of service in the skill-mention parsing. Any authenticated user can send a chat message that makes the regexes backtrack for a long time, stalling the whole instance for all users. Upgrade to version 0.10.0.

Written 5 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
6.5 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0057, the 47th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:40 UTC First seen by agentprime
  2. 31 Oct 2026, 14:40 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.