{"id":"UBUNTU-CVE-2026-49478","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.","modified":"2026-08-19T13:32:17.638519376Z","published":"2026-08-13T13:19:00Z","upstream":["CVE-2026-49478"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-49478"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-49478"},{"type":"REPORT","url":"https://github.com/sigstore/fulcio/pull/2354"}],"affected":[{"package":{"name":"golang-github-sigstore-fulcio","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/golang-github-sigstore-fulcio?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.5-1","1.7.1-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.7.1-1","binary_name":"golang-github-sigstore-fulcio-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-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"},{"type":"Ubuntu","score":"medium"}]}