{"id":"CVE-2026-70485","title":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform","summary":"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 litera…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N","cwe":["CWE-918"],"vendor":"openwebui","product":"open_webui","affected":["open_webui >= 0.9.0, < 0.11.0"],"patched":["open_webui 0.11.0"],"published":"2026-08-04","updated":"2026-09-18","sourceUpdated":"2026-09-18T14:46:45.820","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-70485","references":[{"url":"https://github.com/open-webui/open-webui/commit/1717b493d83c86afa82aa8bc50139250852dd2f3","label":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/releases/tag/v0.11.0","label":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-8x5v-cpv7-8jjp","label":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-8x5v-cpv7-8jjp","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-8x5v-cpv7-8jjp"}],"tags":["nvd","ghsa","pip"],"epss":0.0023,"epssPercentile":0.14034,"aliases":["GHSA-8x5v-cpv7-8jjp"],"ecosystem":"pip","ingestedAt":"2026-08-04T20:41:43.856Z","slug":"CVE-2026-70485","body":"## Overview\n\nOpen 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.\n\n## Affected\n\n- `open_webui >= 0.9.0, < 0.11.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `open_webui 0.11.0`\n\n## Package advisory (CVE-2026-70485)\n\nAffected packages:\n\n- `open-webui >= 0.9.0, < 0.11.0`\n\nPatched in:\n\n- `open-webui 0.11.0`\n\nSource: https://github.com/advisories/GHSA-8x5v-cpv7-8jjp","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}