{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-39956", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-07T22:40:33.822Z", "datePublished": "2026-04-13T22:10:18.817Z", "dateUpdated": "2026-04-14T16:28:19.908Z"}, "containers": {"cna": {"title": "jq: Missing runtime type checks for _strindices lead to crash and limited memory disclosure", "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "lang": "en", "description": "CWE-125: Out-of-bounds Read", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-476", "lang": "en", "description": "CWE-476: NULL Pointer Dereference", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-843", "lang": "en", "description": "CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"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"}}], "references": [{"name": "https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28"}, {"name": "https://github.com/jqlang/jq/commit/fdf8ef0f0810e3d365cdd5160de43db46f57ed03", "tags": ["x_refsource_MISC"], "url": "https://github.com/jqlang/jq/commit/fdf8ef0f0810e3d365cdd5160de43db46f57ed03"}], "affected": [{"vendor": "jqlang", "product": "jq", "versions": [{"version": ">= 69785bf77f86e2ea1b4a20ca86775916889e91c9, < fdf8ef0f0810e3d365cdd5160de43db46f57ed03", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-13T22:10:18.817Z"}, "descriptions": [{"lang": "en", "value": "jq is a command-line JSON processor. In commits after 69785bf77f86e2ea1b4a20ca86775916889e91c9, 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."}], "source": {"advisory": "GHSA-6gc3-3g9p-xx28", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-14T15:34:20.696741Z", "id": "CVE-2026-39956", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"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": "2026-04-14T16:28:19.908Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "jq is a command-line JSON processor. In commits after 69785bf77f86e2ea1b4a20ca86775916889e91c9, 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."}], "id": "CVE-2026-39956", "lastModified": "2026-04-14T17:16:52.203", "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"}]}, "published": "2026-04-13T23:16:27.653", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/jqlang/jq/commit/fdf8ef0f0810e3d365cdd5160de43db46f57ed03"}, {"source": "security-advisories@github.com", "url": "https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "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"}], "analysis": {"en": {"generated_at": "2026-04-13T23:21:14.625008+00:00", "value": {"mitigation_remediation": ["Update jq to a version containing commit fdf8ef0f0810e3d365cdd5160de43db46f57ed03 or later", "Verify that the installed jq binary has been built without the -DNDEBUG define and includes the patch", "If an immediate upgrade is not possible, restrict the execution of jq to trusted input only or run it in a sandboxed environment", "Consider using stricter input validation around JSON filters before passing them to jq"], "summary": {"action": "Patch immediately", "impact": "Memory disclosure and denial of service due to improper type checks in _strindices"}, "threat_synthesis": {"affected_systems": "The affected product is jq, a command\u2011line JSON processor maintained by the jqlang community. All jq releases built after commit\u00a069785bf77f86e2ea1b4a20ca86775916889e91c9, up to the patched commit\u00a0fdf8ef0f0810e3d365cdd5160de43db46f57ed03, are vulnerable. Specific version ranges are not enumerated but any distribution package containing jq built from source before the patch is susceptible.", "description_and_impact": "The vulnerability arises from the _strindices builtin passing arguments directly to a string indexer without validating that the input is actually a string. In a release build, missing assertions allow the function to dereference a pointer derived from an arbitrary numeric value. This results in a program crash, and by crafting a numeric payload that maps to a chosen IEEE\u2011754 bit pattern, an attacker can read small amounts of memory around that pointer. The effect is a denial\u2011of\u2011service condition and limited memory disclosure. The weakness maps to dereference of null or invalid pointers and misuse of type casting.", "risk_and_exploitability": "The CVSS base score of 6.1 indicates a moderate severity. EPSS data is unavailable, and the vulnerability is not listed in the CISA KEV catalog, suggesting a lower exploitation probability in the wild. The attack vector is likely local: a user who can supply or influence a jq filter can trigger the crash or trigger the memory read primitive. In contexts where jq processes untrusted input in a server or privileged environment, the danger escalates to a remote denial\u2011of\u2011service. The exploitation requires only the presence of a vulnerable jq binary and crafted input, making it relatively easy to perform once the target is known."}}}}, "created": "2026-04-14T16:17:02.055604+00:00", "updated": "2026-04-14T16:32:53.394567+00:00", "vendors": ["jqlang", "jqlang$PRODUCT$jq"]}