{"id":"CVE-2026-55245","title":"Bifrost is an enterprise AI gateway for routing requests to model providers","summary":"Bifrost is an enterprise AI gateway for routing requests to model providers. Prior to 1.5.17, the isPublicIP function in core/providers/utils/fetch.go, reached through FetchAndEncodeURL for Bedrock and Vertex image or document URLs, clas…","severity":"high","cwe":["CWE-918"],"vendor":"maximhq","product":"github.com/maximhq/bifrost/core","affected":["github.com/maximhq/bifrost/core < 1.5.17"],"patched":["github.com/maximhq/bifrost/core 1.5.17"],"published":"2026-08-28","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:09:13.080","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55245","references":[{"url":"https://github.com/maximhq/bifrost/commit/54ec431fc5255ff42c36420d88549477e0b33d89","label":"security-advisories@github.com"},{"url":"https://github.com/maximhq/bifrost/pull/4092","label":"security-advisories@github.com"},{"url":"https://github.com/maximhq/bifrost/releases/tag/core/v1.5.17","label":"security-advisories@github.com"},{"url":"https://github.com/maximhq/bifrost/security/advisories/GHSA-w98g-5w9p-p3rc","label":"security-advisories@github.com"},{"url":"https://github.com/maximhq/bifrost/security/advisories/GHSA-w98g-5w9p-p3rc","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-w98g-5w9p-p3rc"}],"tags":["nvd","ghsa","go"],"epss":0.00447,"epssPercentile":0.38309,"aliases":["GHSA-w98g-5w9p-p3rc"],"ecosystem":"go","ingestedAt":"2026-08-28T19:24:19.530Z","slug":"CVE-2026-55245","body":"## Overview\n\nBifrost is an enterprise AI gateway for routing requests to model providers. Prior to 1.5.17, the isPublicIP function in core/providers/utils/fetch.go, reached through FetchAndEncodeURL for Bedrock and Vertex image or document URLs, classifies Carrier-Grade NAT 100.64.0.0/10, IPv6 6to4 2002::/16, NAT64 64:ff9b::/96 and 64:ff9b:1::/48, and deprecated IPv6 site-local fec0::/10 addresses as public. A remote attacker who controls a multimodal request URL can make the gateway fetch internal services, including a cloud instance metadata endpoint encoded through 6to4 or NAT64. This issue is fixed in version 1.5.17.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-55245)\n\nAffected packages:\n\n- `github.com/maximhq/bifrost/core < 1.5.17`\n\nPatched in:\n\n- `github.com/maximhq/bifrost/core 1.5.17`\n\nSource: https://github.com/advisories/GHSA-w98g-5w9p-p3rc","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}