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Advisory record · GHSA-8x5v-cpv7-8jjp

Open WebUI: Any authenticated user can reach internal services and cloud metadata via NAT64-encoded URLs

CVSS 7.1 HighEPSS 0.0035 · 29th percentile

Published by the GitHub Advisory Database at 4 Aug 2026, 19:59 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
open-webuiPyPI>=0.9.0, <0.11.00.11.0
Identifiers
GHSA-8x5v-cpv7-8jjp · CVE-2026-70485 · PYSEC-2026-3645
Weakness (CWE)
CWE-918
Tags
Published
4 Aug 2026
Updated
10 Aug 2026

Machine-written summary

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

Open WebUI versions 0.9.0 up to (but not including) 0.11.0 can be abused by any authenticated user to read internal or cloud-metadata responses. The server's check on fetched URLs misses IPv4 addresses wrapped in NAT64 IPv6 form, so this works only on networks with a NAT64 gateway. Upgrade to Open WebUI 0.11.0 or later; no configuration change is needed.

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
7.1 High 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0035, the 29th percentile, on 11 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.