{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64655", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-20T17:11:30.896Z", "datePublished": "2026-08-06T18:41:54.628Z", "dateUpdated": "2026-08-06T18:41:54.628Z"}, "containers": {"cna": {"title": "GitHub CLI: Attestation Verification Bypass via Unescaped Regex Metacharacters in SAN Matching", "problemTypes": [{"descriptions": [{"cweId": "CWE-185", "lang": "en", "description": "CWE-185: Incorrect Regular Expression", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "baseScore": 2.1, "baseSeverity": "LOW", "vectorString": "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", "version": "4.0"}}], "references": [{"name": "https://github.com/cli/cli/security/advisories/GHSA-mm27-mwq9-fr5g", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/cli/cli/security/advisories/GHSA-mm27-mwq9-fr5g"}, {"name": "https://github.com/cli/cli/commit/55dbb4dc6b7edb10b48e3d7fc5bccd32318d1b55", "tags": ["x_refsource_MISC"], "url": "https://github.com/cli/cli/commit/55dbb4dc6b7edb10b48e3d7fc5bccd32318d1b55"}, {"name": "https://github.com/cli/cli/releases/tag/v2.97.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/cli/cli/releases/tag/v2.97.0"}], "affected": [{"vendor": "cli", "product": "cli", "versions": [{"version": "< 2.97.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-06T18:41:54.628Z"}, "descriptions": [{"lang": "en", "value": "GitHub CLI (gh) is GitHub\u2019s 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."}], "source": {"advisory": "GHSA-mm27-mwq9-fr5g", "discovery": "UNKNOWN"}}}}

{}

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{}