{
    "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": "2026-08-08T02:23:17.134Z"
    },
    "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’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."
                }
            ],
            "source": {
                "advisory": "GHSA-mm27-mwq9-fr5g",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-08T02:23:02.313002Z",
                                "id": "CVE-2026-64655",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-08-08T02:23:17.134Z"
                }
            }
        ]
    }
}