jq is a command-line JSON processor. Prior to 1.8.2, comparing two sufficiently deeply nested arrays with the == operator exhausts the C stack on jq's ordinary command-line surface, resulting in denial of service via stack exhaustion (uncontrolled recursion). The crash occurs in jq's recursive structural comparison code, with the recursion repeating through jvp_array_equal() and jv_equal() in src/jv.c when comparing deeply nested arrays; a nearby sort comparator path through jv_cmp() in src/jv_aux.c overflows the stack at a larger nesting depth from the same missing recursion guard. Anyone running jq comparisons on attacker-controlled deeply nested JSON values, or embedding jq in a context where untrusted data can reach the == comparison path, is affected. This vulnerability is fixed in 1.8.2.

A flaw was found in jq, a command-line JSON processor. This vulnerability allows a local user or an attacker providing malicious input to cause a denial of service (DoS) by comparing two sufficiently deeply nested arrays using the '==' operator. This action exhausts the C stack due to uncontrolled recursion, leading to a crash of the jq process.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Red Hat Hardened Images 2026-06-25T00:00:00Z RHSA-2026:29986 jq-main-1.8.2-0.1.hum1 Red Hat Ansible Automation Platform 2 Fix deferred ansible-automation-platform-26/controller-rhel9 Red Hat Ansible Automation Platform 2 Fix deferred ansible-automation-platform-26/hub-rhel9 Red Hat Ansible Automation Platform 2 Fix deferred ansible-automation-platform-27/controller-rhel9 Red Hat Ansible Automation Platform 2 Fix deferred ansible-automation-platform-27/hub-rhel9 Red Hat Ansible Automation Platform 2 Fix deferred automation-controller Red Hat Ceph Storage 4 Fix deferred jq Red Hat Enterprise Linux 10 Fix deferred jq Red Hat Enterprise Linux 8 Fix deferred jq Red Hat Enterprise Linux 9 Fix deferred jq Red Hat OpenShift Container Platform 4 Fix deferred rhcos https://www.cve.org/CVERecord?id=CVE-2026-47770 https://nvd.nist.gov/vuln/detail/CVE-2026-47770 https://github.com/jqlang/jq/security/advisories/GHSA-3pgx-frr7-3jxp