{"id":"CVE-2026-64655","revision":"f4a3643b9a0148f6ad5cd9a2e1ba9fa6","records":[{"revision":"f4a3643b9a0148f6ad5cd9a2e1ba9fa6","observedAt":"2026-10-25T15:18:45.851+00:00","statement":{"source":"nvd","id":"CVE-2026-64655","aliases":[],"title":"GitHub CLI (gh) is GitHub’s official command line tool. Prior to 2.97.0, gh attestation verify\u00A0 builds the certificate Subject Alternative Name matcher from the --signer-repo and --signer-workflow\u00A0 flag values without escaping regex metacha…","description":"GitHub CLI (gh) is GitHub’s official command line tool. Prior to 2.97.0, gh attestation verify\u00A0 builds the certificate Subject Alternative Name matcher from the --signer-repo and --signer-workflow\u00A0 flag values without escaping regex metacharacters, so a user-supplied repository or workflow name is treated as a regular expression rather than a literal string. Because GitHub permits characters such as \u00A0`.`\u00A0 in organization, repository, and workflow path names and \u00A0`.`\u00A0 is a regex wildcard, an attacker can register a lookalike name (for example\u00A0github/artifact.attestations-workflows) that satisfies a matcher intended for a different trusted signer (github/artifact-attestations-workflows), bypassing the intended Sigstore attestation verification. Exploitation requires the attacker to create a plausible lookalike repository and produce valid attestations from it, which could undermine supply chain verification for CI/CD pipelines or policy gates that pin trust to a specific signing workflow. This issue is fixed in version 2.97.0.","state":0,"publishedAt":"2026-08-06T22:18:13.527+00:00","modifiedAt":"2026-09-10T20:36:14.34+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":2.1,"severity":"LOW"}],"references":["https://github.com/cli/cli/commit/55dbb4dc6b7edb10b48e3d7fc5bccd32318d1b55","https://github.com/cli/cli/releases/tag/v2.97.0","https://github.com/cli/cli/security/advisories/GHSA-mm27-mwq9-fr5g"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64655","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-185"],"productCriteria":[],"sourceDates":{"published":"2026-08-06T22:18:13.527","lastModified":"2026-09-10T20:36:14.340"},"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-2026-64655","identifiers":["CVE-2026-64655"]},"retained":false,"historicalAffected":[]}],"coverage":[]}