{"cve":"CVE-2026-49478","nvd":{"published":"2026-08-13T13:19:09.790","modified":"2026-10-24T16:10:00.153","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N","score":8.7},"cwes":["CWE-918"],"references":["https://github.com/sigstore/fulcio/commit/378c654f48c3bafdced04ead7010aab2cb4c6ca1","https://github.com/sigstore/fulcio/pull/2354","https://github.com/sigstore/fulcio/releases/tag/v1.8.6","https://github.com/sigstore/fulcio/security/advisories/GHSA-f5mr-q85p-6hh6"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:35.584907681+00:00"},"epss":{"cve":"CVE-2026-49478","score":0.00282,"percentile":0.20468,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-f5mr-q85p-6hh6","url":"https://osv.dev/vulnerability/GHSA-f5mr-q85p-6hh6","summary":"Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage","modified":"2026-09-10T03:50:49.276908685Z","packages":[{"ecosystem":"Go","name":"github.com/sigstore/fulcio","purl":"pkg:golang/github.com/sigstore/fulcio","ranges":["<1.8.6"],"fixed":["1.8.6"]}]},{"id":"GO-2026-5853","url":"https://osv.dev/vulnerability/GO-2026-5853","summary":"Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage in github.com/sigstore/fulcio","modified":"2026-07-10T18:29:34.740186874Z","packages":[{"ecosystem":"Go","name":"github.com/sigstore/fulcio","purl":"pkg:golang/github.com/sigstore/fulcio","ranges":["<1.8.6"],"fixed":["1.8.6"]}]}],"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."]}