{"id":"CVE-2026-49478","state":"PUBLISHED","title":"Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage","description":"Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Versions through 1.8.5 improperly follow cross-host redirects and attach Kubernetes ServiceAccount tokens during OIDC discovery, allowing a malicious or compromised issuer to perform blind SSRF, substitute and cache malicious JWKS keys, or disclose ServiceAccount tokens to external hosts. Version 1.8.6 blocks cross-host redirects, restricts token injection, and restricts local token loading. No known workarounds are available.","publishedAt":"2026-08-13T13:08:21.498Z","updatedAt":"2026-08-15T03:14:47.189Z","severity":{"score":8.7,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["sigstore fulcio"],"affected":[{"vendor":"sigstore","product":"fulcio","versions":[{"version":"< 1.8.6","status":"affected"}]}],"references":["https://github.com/sigstore/fulcio/security/advisories/GHSA-f5mr-q85p-6hh6","https://github.com/sigstore/fulcio/pull/2354","https://github.com/sigstore/fulcio/commit/378c654f48c3bafdced04ead7010aab2cb4c6ca1","https://github.com/sigstore/fulcio/releases/tag/v1.8.6"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/49xxx/CVE-2026-49478.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-49478","state":"PUBLISHED","datePublished":"2026-08-13T13:08:21.498Z","dateUpdated":"2026-08-15T03:14:47.189Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-30T04:17:43.095Z"},"containers":{"cna":{"title":"Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage","descriptions":[{"lang":"en","value":"Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Versions through 1.8.5 improperly follow cross-host redirects and attach Kubernetes ServiceAccount tokens during OIDC discovery, allowing a malicious or compromised issuer to perform blind SSRF, substitute and cache malicious JWKS keys, or disclose ServiceAccount tokens to external hosts. Version 1.8.6 blocks cross-host redirects, restricts token injection, and restricts local token loading. No known workarounds are available."}],"affected":[{"vendor":"sigstore","product":"fulcio","versions":[{"version":"< 1.8.6","status":"affected"}]}],"references":[{"url":"https://github.com/sigstore/fulcio/security/advisories/GHSA-f5mr-q85p-6hh6","name":"https://github.com/sigstore/fulcio/security/advisories/GHSA-f5mr-q85p-6hh6","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/sigstore/fulcio/pull/2354","name":"https://github.com/sigstore/fulcio/pull/2354","tags":["x_refsource_MISC"]},{"url":"https://github.com/sigstore/fulcio/commit/378c654f48c3bafdced04ead7010aab2cb4c6ca1","name":"https://github.com/sigstore/fulcio/commit/378c654f48c3bafdced04ead7010aab2cb4c6ca1","tags":["x_refsource_MISC"]},{"url":"https://github.com/sigstore/fulcio/releases/tag/v1.8.6","name":"https://github.com/sigstore/fulcio/releases/tag/v1.8.6","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-13T13:08:21.498Z"},"source":{"advisory":"GHSA-f5mr-q85p-6hh6","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-15T03:14:38.396830Z","id":"CVE-2026-49478","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-15T03:14:47.189Z"}}]}}}