CVE-2026-39956

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{"affected": [{"affectedData": [{"product": "jq", "vendor": "jqlang", "versions": [{"status": "affected", "version": "< 1.8.2"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:*", "matchCriteriaId": "268F5CFD-46C6-4090-A7CD-F85927DE3B70", "versionEndExcluding": "2026-04-08", "versionStartIncluding": "2026-04-02", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "jq is a command-line JSON processor. Prior to version 1.8.2, the _strindices builtin in jq's src/builtin.c passes its arguments directly to jv_string_indexes() without verifying they are strings, and jv_string_indexes() in src/jv.c relies solely on assert() checks that are stripped in release builds compiled with -DNDEBUG. This allows an attacker to crash jq trivially with input like _strindices(0), and by crafting a numeric value whose IEEE-754 bit pattern maps to a chosen pointer, achieve a controlled pointer dereference and limited memory read/probe primitive. Any deployment that evaluates untrusted jq filters against a release build is vulnerable. This issue has been patched in commit fdf8ef0f0810e3d365cdd5160de43db46f57ed03, which is part of version 1.8.2."}, {"lang": "es", "value": "jq es un procesador JSON de l\u00ednea de comandos. En commits posteriores a 69785bf77f86e2ea1b4a20ca86775916889e91c9, la funci\u00f3n _strindices incorporada en src/builtin.c de jq pasa sus argumentos directamente a jv_string_indexes() sin verificar que sean cadenas, y jv_string_indexes() en src/jv.c se basa \u00fanicamente en comprobaciones assert() que se eliminan en las compilaciones de lanzamiento compiladas con -DNDEBUG. Esto permite a un atacante bloquear jq trivialmente con una entrada como _strindices(0), y al elaborar un valor num\u00e9rico cuyo patr\u00f3n de bits IEEE-754 se mapea a un puntero elegido, lograr una desreferencia de puntero controlada y una primitiva limitada de lectura/sondeo de memoria. Cualquier despliegue que eval\u00fae filtros jq no confiables contra una compilaci\u00f3n de lanzamiento es vulnerable. Este problema ha sido parcheado en el commit fdf8ef0f0810e3d365cdd5160de43db46f57ed03."}], "id": "CVE-2026-39956", "lastModified": "2026-10-26T21:10:00.170", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-39956", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-14T15:34:20.696741Z", "version": "2.0.3"}}]}, "published": "2026-04-13T23:16:27.653", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/jqlang/jq/commit/fdf8ef0f0810e3d365cdd5160de43db46f57ed03"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-476"}, {"lang": "en", "value": "CWE-843"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "jq: missing runtime type checks for _strindices lead to crash and limited memory disclosure", "id": "2458076", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458076"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-1287", "details": ["A flaw was found in jq, a command line JSON processor. In release builds, the `_strindices` builtin function calls the `jv_string_indexes` function without checking that the arguments are actually strings. This missing validation allows an attacker who can supply non-string inputs to cause an application crash and a limited memory read."], "mitigation": {"lang": "en:us", "value": "Do not use untrusted input as an argument to a jq builtin, specifically `_strindices`."}, "name": "CVE-2026-39956", "package_state": [{"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Fix deferred", "package_name": "ansible-automation-platform-26/controller-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Fix deferred", "package_name": "ansible-automation-platform-26/hub-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Fix deferred", "package_name": "automation-controller", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ceph_storage:4", "fix_state": "Fix deferred", "package_name": "jq", "product_name": "Red Hat Ceph Storage 4"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "jq", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "jq", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "jq", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-04-13T22:10:18Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-39956\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-39956\nhttps://github.com/jqlang/jq/commit/fdf8ef0f0810e3d365cdd5160de43db46f57ed03\nhttps://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28"], "statement": "To exploit this flaw, a user needs to process JSON input with an attacker-supplied argument to the `_strindices` builtin. This allows the attacker to cause an application crash and a limited memory read with no other security impact. Due to these reasons, this vulnerability has been rated with a moderate severity.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[69785bf77f86e2ea1b4a20ca86775916889e91c9,fdf8ef0f0810e3d365cdd5160de43db46f57ed03)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "jq", "source": "cna", "vendor": "jqlang"}, "product": "jq", "vendor": "jqlang"}], "created": "2026-04-14T16:17:02.055604+00:00", "updated": "2026-09-04T16:00:05.465031+00:00", "vendors": ["jqlang", "jqlang$PRODUCT$jq"]}