{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-40164",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-04-09T19:31:56.014Z",
        "datePublished": "2026-04-13T23:40:12.693Z",
        "dateUpdated": "2026-04-13T23:40:12.693Z"
    },
    "containers": {
        "cna": {
            "title": "jq: Algorithmic complexity DoS via hardcoded MurmurHash3 seed",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-328",
                            "lang": "en",
                            "description": "CWE-328: Use of Weak Hash",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-407",
                            "lang": "en",
                            "description": "CWE-407: Inefficient Algorithmic Complexity",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "HIGH",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/jqlang/jq/security/advisories/GHSA-wwj8-gxm6-jc29",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/jqlang/jq/security/advisories/GHSA-wwj8-gxm6-jc29"
                },
                {
                    "name": "https://github.com/jqlang/jq/commit/0c7d133c3c7e37c00b6d46b658a02244fdd3c784",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/jqlang/jq/commit/0c7d133c3c7e37c00b6d46b658a02244fdd3c784"
                }
            ],
            "affected": [
                {
                    "vendor": "jqlang",
                    "product": "jq",
                    "versions": [
                        {
                            "version": "< 0c7d133c3c7e37c00b6d46b658a02244fdd3c784",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-04-13T23:40:12.693Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "jq is a command-line JSON processor. Before commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784, jq used MurmurHash3 with a hardcoded, publicly visible seed (0x432A9843) for all JSON object hash table operations, which allowed an attacker to precompute key collisions offline. By supplying a crafted JSON object (~100 KB) where all keys hashed to the same bucket, hash table lookups degraded from O(1) to O(n), turning any jq expression into an O(n²) operation and causing significant CPU exhaustion. This affected common jq use cases such as CI/CD pipelines, web services, and data processing scripts, and was far more practical to exploit than existing heap overflow issues since it required only a small payload. This issue has been patched in commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784."
                }
            ],
            "source": {
                "advisory": "GHSA-wwj8-gxm6-jc29",
                "discovery": "UNKNOWN"
            }
        }
    }
}