{"id":"CVE-2025-66506","revision":"7d270275e52843b282268e514a9e6626","records":[{"revision":"7d270275e52843b282268e514a9e6626","observedAt":"2026-10-25T03:17:36.152+00:00","statement":{"source":"nvd","id":"CVE-2025-66506","aliases":[],"title":"Fulcio is a free-to-use certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Prior to 1.8.3, function identity.extractIssuerURL splits (via a call to strings.Split) its argument (which is untrus…","description":"Fulcio is a free-to-use certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Prior to 1.8.3, function identity.extractIssuerURL splits (via a call to strings.Split) its argument (which is untrusted data) on periods. As a result, in the face of a malicious request with an (invalid) OIDC identity token in the payload containing many period characters, a call to extractIssuerURL incurs allocations to the tune of O(n) bytes (where n stands for the length of the function's argument), with a constant factor of about 16. This vulnerability is fixed in 1.8.3.","state":0,"publishedAt":"2025-12-04T22:15:49.503+00:00","modifiedAt":"2026-10-18T15:10:00.097+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/sigstore/fulcio/commit/765a0e57608b9ef390e1eeeea8595b9054c63a5a","https://github.com/sigstore/fulcio/security/advisories/GHSA-f83f-xpx7-ffpw"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-66506","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-405"],"productCriteria":["cpe:2.3:a:linuxfoundation:fulcio:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2025-12-04T22:15:49.503","lastModified":"2026-10-18T15:10:00.097"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2025-66506","identifiers":["CVE-2025-66506"]},"retained":false,"historicalAffected":[]}],"coverage":[]}