What is CVE-2026-40164?

CVE-2026-40164 is a high-severity vulnerability in Jqlang Jq, classified under Use of Weak Hash. CVSS score: 7.5/10. Published 2026-04-14.

How severe is CVE-2026-40164?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Jqlang Jq

CVE-2026-40164

jq is a command-line JSON processor. Before commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784, jq used MurmurHash3 with a hardcoded, publicly visible seed (0x432A9843) for all JSON object hash table operations, which allowed an attacker to p…

EPSS: 0.000 (7.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Jqlang Jq — versions < 0c7d133c3c7e37c00b6d46b658a02244fdd3c784

Weakness classification (CWE)

References

https://github.com/jqlang/jq/security/advisories/GHSA-wwj8-gxm6-jc29 (x_refsource_CONFIRM)
https://github.com/jqlang/jq/commit/0c7d133c3c7e37c00b6d46b658a02244fdd3c784 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-40164?: CVE-2026-40164 is a high-severity vulnerability in Jqlang Jq, classified under Use of Weak Hash. CVSS score: 7.5/10. Published 2026-04-14.
How severe is CVE-2026-40164?: High severity. CVSS v3 base score is 7.5 out of 10.