CVE-2026-64655
- Source
- https://cve.org/CVERecord?id=CVE-2026-64655
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64655.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-64655
- Aliases
-
- GHSA-mm27-mwq9-fr5g
- Downstream
- Related
- Published
- 2026-08-06T18:41:54.628Z
- Modified
- 2026-08-27T17:40:58.029356131Z
- Severity
-
- 2.1 (Low) CVSS_V4 - 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 CVSS Calculator
- Summary
- GitHub CLI: Attestation Verification Bypass via Unescaped Regex Metacharacters in SAN Matching
- Details
-
GitHub CLI (gh) is GitHub’s official command line tool. Prior to 2.97.0, gh attestation verify builds the certificate Subject Alternative Name matcher from the --signer-repo and --signer-workflow 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
.in organization, repository, and workflow path names and.is a regex wildcard, an attacker can register a lookalike name (for example github/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. - Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64655.json", "cwe_ids": [ "CWE-185" ], "cna_assigner": "GitHub_M" }- References
-
- https://github.com/cli/cli/releases/tag/v2.97.0
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64655.json
- https://github.com/cli/cli/security/advisories/GHSA-mm27-mwq9-fr5g
- https://nvd.nist.gov/vuln/detail/CVE-2026-64655
- https://github.com/cli/cli/commit/55dbb4dc6b7edb10b48e3d7fc5bccd32318d1b55