{"schemaVersion":3,"id":"CVE-2026-55245","aliases":["GHSA-w98g-5w9p-p3rc","GO-2026-6320"],"status":"published","duplicateOf":null,"title":"Bifrost: SSRF deny-list incomplete: isPublicIP permits CGNAT, IPv6 6to4/NAT64, and site-local in FetchAndEncodeURL","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.","dates":{"published":"2026-08-28T18:24:16.723Z","modified":"2026-08-28T19:54:10.966Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.7,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":8.7,"severity":"high","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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Go","score":8.7,"severity":"high","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","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":8.7,"severity":"high","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00611,"percentile":0.48564,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0.164,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.00447},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00447,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00447,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00447,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00447,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00447,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00447,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00447,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00447,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00447,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00447,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00611,"percentile":0.48564}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00447,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00447,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00611,"percentile":0.48564}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-918","name":"Server-Side Request Forgery (SSRF)","description":"The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/918.html"}],"affected":[{"vendor":"github.com/maximhq/bifrost","product":"core","name":"github.com/maximhq/bifrost/core","label":"core","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/maximhq/bifrost/core","purlType":"golang","versions":[{"text":"< 1.5.17","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.5.17","eol":null,"hubHref":null},{"vendor":"maximhq","product":"bifrost","name":"Bifrost","label":"bifrost","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 1.5.17","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.5.17","eol":null,"hubHref":"/vendor/maximhq/bifrost"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/maximhq/bifrost/security/advisories/GHSA-w98g-5w9p-p3rc","label":"github.com/maximhq/bifrost/security/advisories/GHSA-w98g-5w9p-p3rc","hostname":"github.com","tags":["X Refsource CONFIRM","WEB","Advisory"]},{"url":"https://github.com/maximhq/bifrost/pull/4092","label":"github.com/maximhq/bifrost/pull/4092","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/maximhq/bifrost/commit/54ec431fc5255ff42c36420d88549477e0b33d89","label":"github.com/maximhq/bifrost/commit/54ec431fc5255ff42c36420d88549477e0b33d89","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/maximhq/bifrost/releases/tag/core/v1.5.17","label":"github.com/maximhq/bifrost/releases/tag/core/v1.5.17","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/maximhq/bifrost","label":"github.com/maximhq/bifrost","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:21812-1","SUSE-SU-2026:23692-1","SUSE-SU-2026:23712-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:21812-1","SUSE-SU-2026:23692-1","SUSE-SU-2026:23712-1"]},"timeline":[{"kind":"published","date":"2026-08-28T18:24:16.723Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-28T19:54:10.966Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":35,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T20:42:49.322Z","stale":false,"partial":false}}