Uncontrolled Recursion in jq - CVE-2026-40612

Vulnerability identifier: #VU127880

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-40612

CWE-ID: CWE-674

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to uncontrolled recursion in jv_contains when processing deeply nested arrays or objects through contains() or inside(). A local user can supply a specially crafted nested input structure to cause a denial of service.

In libjq embedded in larger applications, exploitation may corrupt adjacent memory on systems without stack guard pages or with heap-allocated thread stacks.

jq
Debian Linux
openEuler
Anolis OS
Fedora
LANTIME Operating System Firmware (LTOS)
jq (Debian package)
jq-debugsource
jq-help
jq-devel
jq-debuginfo
jq
jq-doc

Install update from vendor's website.

jq - update to 1.8.2
LANTIME Operating System Firmware (LTOS) - update to 7.10.013
jq (Debian package) - update to 1.7.1-6+deb13u3
jq-debugsource - update to 1.8.0-4
jq-help - update to 1.8.0-4
jq-devel - update to 1.8.0-4
jq-debuginfo - update to 1.8.0-4
jq - update to 1.8.0-4
jq-doc - update to 1.8.1-9
jq-devel - update to 1.8.1-9
jq - update to 1.8.1-9
jq - update to 1.8.2-4.fc45

• https://github.com/jqlang/jq/security/advisories/GHSA-r7m6-x9c7-h69j

• Multiple vulnerabilities in jq
• Multiple vulnerabilities in Meinberg LANTIME firmware
• Debian update for jq
• Fedora 45 update for jq
• openEuler 24.03 LTS SP3 update for jq
• openEuler 24.03 LTS update for jq
• openEuler 22.03 LTS SP4 update for jq
• openEuler 20.03 LTS SP4 update for jq
• openEuler 24.03 LTS SP1 update for jq
• Anolis OS update for jq