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Advisory record · GHSA-jqhh-cjmq-vmv6

Open WebUI: Any authenticated user can hang the server via a cyclic chat message history

CVSS 6.5 MediumEPSS 0.0058 · 48th percentile

Published by the GitHub Advisory Database at 9 Sept 2026, 23:53 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
open-webuiPyPI>=0.5.0, <0.11.10.11.1
Identifiers
GHSA-jqhh-cjmq-vmv6 · CVE-2026-88002 · PYSEC-2026-3879
Weakness (CWE)
CWE-835
Tags
Published
9 Sept 2026
Updated
10 Sept 2026

Machine-written summary

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

GHSA-jqhh-cjmq-vmv6: Open WebUI versions from 0.5.0 up to but not including 0.11.1 are affected. Any authenticated user with the default user role can store a chat whose messages reference each other as parents in a cycle, which makes the server's history walk run forever and blocks all requests server-wide. Upgrade to Open WebUI 0.11.1, which fixes the issue; no workaround is given.

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
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 0.0058, the 48th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:10 UTC First seen by agentprime
  2. 31 Oct 2026, 14:10 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.