CVE-2026-70485
Open WebUI: Any authenticated user can reach internal services and cloud metadata via NAT64-encoded URLs
HIGH 7.1EPSS 0.4%
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, Open WebUI checked whether a user-supplied URL destination was globally routable by applying ipaddress.is_global to the literal IPv6 address without examining IPv4 addresses embedded in transition encodings. On a deployment with a NAT64 gateway, any verified user could wrap an internal or cloud-metadata IPv4 address in the NAT64 well-known prefix, pass the filter, and receive the internal response body through RAG URL ingestion, URL-to-markdown conversion, or web-search content retrieval. This issue is fixed in 0.11.0.
- Affected
- open-webui
- CVSS v3.1 GITHUB
- 7.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N - EPSS
- 0.35% chance of exploitation in the next 30 days, 27th percentile
- Published
- 2026-08-04
- Updated
- 2026-08-05
Proof-of-concept exploits (1)
Security advisories
- open-webui/open-webui/security/advisories/GHSA-8x5v-cpv7-8jjp
- open-webui/open-webui/commit/1717b493d83c86afa82aa8bc50139250852dd2f3