Medium 5.4Published May 11, 2026

CVE-2026-40612jq: Stack overflow via unbounded recursion in jv_contains

Updated under an hour ago (Oct 27, 2026, 2:30 PM ET)

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It affects jqlang jq. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for jqlang jq

Exploited in the last 30 days

jq is a command-line JSON processor. In 1.8.1 and earlier, jv_contains recurses into nested arrays/objects with no depth limit. With a sufficiently nested input structure (built programmatically with reduce, since the JSON parser caps at depth 10000), the C stack is exhausted.

CVSS: 5.4 MEDIUM (v4.0, CNA)CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P
Weakness (CWE): CWE-674
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

jqlang jq jqlang:jq (from the name)	through 1.8.1	CNA record
jqlang jq jqlang:jq	through 1.8.1	NVD

References

References

https://github.com/jqlang/jq/security/advisories/GHSA-r7m6-x9c7-h69j	x-refsource-confirm, exploit, mitigation, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.