{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.8.6"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "378c654f48c3bafdced04ead7010aab2cb4c6ca1"
            }
          ],
          "repo": "https://github.com/sigstore/fulcio",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-f5mr-q85p-6hh6"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49478.json"
  },
  "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.",
  "id": "CVE-2026-49478",
  "modified": "2026-08-16T03:31:26.194944079Z",
  "published": "2026-08-13T13:08:21.498Z",
  "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"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage"
}