What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-11 · updated 2026-10-26
• Weakness: CWE-674

Description

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.

Affected products

• jqlang jq: through 1.8.1

References

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

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