{"id":"CVE-2026-39979","title":"jq is a command-line JSON processor","summary":"jq is a command-line JSON processor. In commits before 2f09060afab23fe9390cce7cb860b10416e1bf5f, the jv_parse_sized() API in libjq accepts a counted buffer with an explicit length parameter, but its error-handling path formats the input …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","cwe":["CWE-125"],"vendor":"jqlang","product":"jq","affected":["jq < 2026-04-12"],"patched":["jq 2026-04-12"],"published":"2026-04-13","updated":"2026-07-02","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-39979","references":[{"url":"https://github.com/jqlang/jq/commit/2f09060afab23fe9390cce7cb860b10416e1bf5f","label":"security-advisories@github.com"},{"url":"https://github.com/jqlang/jq/security/advisories/GHSA-2hhh-px8h-355p","label":"security-advisories@github.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:16252","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:16692","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:16693","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:18040","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:18042","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:18043","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:18044","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:18045","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:18046","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:18047","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:18048","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19151","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19365","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:23233","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:23245","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:25044","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:25096","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:25181","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:26528","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:26542","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:28887","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:30078","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:30087","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:30088","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:30089","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:8579","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-39979","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2458077","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://github.com/jqlang/jq/security/advisories/GHSA-2hhh-px8h-355p","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39979.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-39979"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39979"},{"url":"https://access.redhat.com/errata/RHSA-2026:34098"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.0056,"epssPercentile":0.46422,"ingestedAt":"2026-07-02T12:34:40.504Z","scores":{"nvd":6.5,"vendor":8.2},"slug":"CVE-2026-39979","body":"## Overview\n\njq is a command-line JSON processor. In commits before 2f09060afab23fe9390cce7cb860b10416e1bf5f, the jv_parse_sized() API in libjq accepts a counted buffer with an explicit length parameter, but its error-handling path formats the input buffer using %s in jv_string_fmt(), which reads until a NUL terminator is found rather than respecting the caller-supplied length. This means that when malformed JSON is passed in a non-NUL-terminated buffer, the error construction logic performs an out-of-bounds read past the end of the buffer. The vulnerability is reachable by any libjq consumer calling jv_parse_sized() with untrusted input, and depending on memory layout, can result in memory disclosure or process termination. The issue has been patched in commit 2f09060afab23fe9390cce7cb860b10416e1bf5f.\n\n## Affected\n\n- `jq < 2026-04-12`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `jq 2026-04-12`\n\n## Vendor advisories\n\n- **RHSA-2026:26528** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.12 · released 2026-06-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:26528)\n- **RHSA-2026:26542** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.13 · released 2026-06-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:26542)\n- **RHSA-2026:28887** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.14 · released 2026-07-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:28887)\n- **RHSA-2026:23233** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.15 · released 2026-06-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:23233)\n- **RHSA-2026:25044** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.16 · released 2026-06-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:25044)\n- **RHSA-2026:34098** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.17 · released 2026-07-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:34098)\n- **RHSA-2026:25181** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.18 · released 2026-06-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:25181)\n- **RHSA-2026:23245** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.19 · released 2026-06-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:23245)\n- **RHSA-2026:16252** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-05-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:16252)\n- **RHSA-2026:18048** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-05-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:18048)\n- **RHSA-2026:18047** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream E4S (v.8.6), Red Hat Enterprise Linux AppStream TUS (v.8.6) · released 2026-05-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:18047)\n- **Red Hat VEX** · Important · affected: Red Hat Ansible Automation Platform 2, Red Hat Ceph Storage 4 · no fix planned: Red Hat Ceph Storage 4, Red Hat Ansible Automation Platform 2 · updated 2026-10-02 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39979.json)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}