{"id":"CVE-2026-70485","aliases":["GHSA-8x5v-cpv7-8jjp","PYSEC-2026-3645"],"url":"https://o3.security/vulnerability/CVE-2026-70485","summary":"Open WebUI: Any authenticated user can reach internal services and cloud metadata via NAT64-encoded URLs","details":"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.","published":"2026-08-04T19:59:21.539Z","modified":"2026-09-10T03:30:53.602769976Z","cvss":{"score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N"},"epss":{"score":0.00222,"percentile":0.12624,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"open-webui","fixedVersion":"0.11.0"}],"fix":{"url":"https://github.com/open-webui/open-webui/commit/1717b493d83c86afa82aa8bc50139250852dd2f3","label":"open-webui/open-webui@1717b49"},"references":[{"type":"WEB","url":"https://github.com/open-webui/open-webui/releases/tag/v0.11.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70485.json"},{"type":"ADVISORY","url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-8x5v-cpv7-8jjp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70485"},{"type":"FIX","url":"https://github.com/open-webui/open-webui/commit/1717b493d83c86afa82aa8bc50139250852dd2f3"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T03:30:53.602769976Z"}}