{"id":"CVE-2026-49478","summary":"Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage","details":"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.","aliases":["GHSA-f5mr-q85p-6hh6","GO-2026-5853"],"modified":"2026-08-16T03:31:26.194944079Z","published":"2026-08-13T13:08:21.498Z","related":["CGA-m9fm-v3rr-527q","openSUSE-SU-2026:21483-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49478.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-918"]},"references":[{"type":"WEB","url":"https://github.com/sigstore/fulcio/releases/tag/v1.8.6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49478.json"},{"type":"ADVISORY","url":"https://github.com/sigstore/fulcio/security/advisories/GHSA-f5mr-q85p-6hh6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49478"},{"type":"FIX","url":"https://github.com/sigstore/fulcio/commit/378c654f48c3bafdced04ead7010aab2cb4c6ca1"},{"type":"FIX","url":"https://github.com/sigstore/fulcio/pull/2354"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/sigstore/fulcio","events":[{"introduced":"0"},{"fixed":"378c654f48c3bafdced04ead7010aab2cb4c6ca1"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.8.6"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.8.5","v1.8.4","v1.8.3","v1.8.2","v1.8.1","v1.8.0","v1.7.1","v1.7.0","v1.6.6","v1.6.5","v1.6.4","v1.6.3","v1.6.2","v1.6.1","v1.6.0","v1.5.1","v1.5.0","v1.4.5","v1.4.4","v1.4.3","v1.4.2","v1.4.1","v1.4.0","v1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.2.0","v1.1.0","v1.0.0","v1.0.0-rc.0","v0.6.0","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.1","v0.4.0","v0.3.0","v0.2.0","v0.1.1","0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49478.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N"}]}