{"id":"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.","aliases":["GHSA-8x5v-cpv7-8jjp","PYSEC-2026-3645"],"modified":"2026-08-12T03:51:29.044228486Z","published":"2026-08-04T19:59:21.539Z","database_specific":{"cwe_ids":["CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70485.json","cna_assigner":"GitHub_M"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/open-webui/open-webui","events":[{"introduced":"f31768e20e5c6b4f6da0ef657877298b359936cf"},{"fixed":"1717b493d83c86afa82aa8bc50139250852dd2f3"},{"fixed":"f9590b8017199e56d5e953657e6498e3cef1d246"}],"database_specific":{"extracted_events":[{"introduced":"0.9.0"},{"fixed":"0.11.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v0.10.2","v0.10.1","v0.10.0","v0.9.5","v0.9.4","v0.9.3","v0.9.2","v0.9.1","v0.9.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-70485.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N"}]}