GHSA-MM27-MWQ9-FR5G GitHub CLI allows attestation verification bypass through unescaped regex metacharacters

Summary A security vulnerability has been identified in GitHub CLI that could allow attestation verification bypass when using gh attestation verify with --signer-repo or --signer-workflow flags. GitHub CLI builds the certificate matcher from these flag values without escaping regex metacharacter...

CVE-2026-64655: Incorrect Regular Expression

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...