{"cve":"CVE-2026-55245","nvd":{"published":"2026-08-28T20:18:26.743","modified":"2026-09-09T21:09:13.080","status":"Deferred","description":"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, 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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":null,"cwes":["CWE-918"],"references":["https://github.com/maximhq/bifrost/commit/54ec431fc5255ff42c36420d88549477e0b33d89","https://github.com/maximhq/bifrost/pull/4092","https://github.com/maximhq/bifrost/releases/tag/core/v1.5.17","https://github.com/maximhq/bifrost/security/advisories/GHSA-w98g-5w9p-p3rc","https://github.com/maximhq/bifrost/security/advisories/GHSA-w98g-5w9p-p3rc"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-55245","score":0.00611,"percentile":0.4925,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-w98g-5w9p-p3rc","url":"https://osv.dev/vulnerability/GHSA-w98g-5w9p-p3rc","summary":"Bifrost's SSRF deny-list is incomplete: isPublicIP permits CGNAT, IPv6 6to4/NAT64, and site-local in FetchAndEncodeURL","modified":"2026-09-02T19:55:46.494426956Z","packages":[{"ecosystem":"Go","name":"github.com/maximhq/bifrost/core","purl":"pkg:golang/github.com/maximhq/bifrost/core","ranges":["<1.5.17"],"fixed":["1.5.17"]}]},{"id":"GO-2026-6320","url":"https://osv.dev/vulnerability/GO-2026-6320","summary":"Bifrost's SSRF deny-list is incomplete: isPublicIP permits CGNAT, IPv6 6to4/NAT64, and site-local in FetchAndEncodeURL in github.com/maximhq/bifrost/core","modified":"2026-09-02T19:45:12.632040616Z","packages":[{"ecosystem":"Go","name":"github.com/maximhq/bifrost/core","purl":"pkg:golang/github.com/maximhq/bifrost/core","ranges":["<1.5.17"],"fixed":["1.5.17"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}