Vulnerability Details CVE-2026-47770
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 1.6%
CVSS Severity
CVSS v3 Score 5.5
Products affected by CVE-2026-47770
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cpe:2.3:a:jqlang:jq:1.0
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cpe:2.3:a:jqlang:jq:1.1
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cpe:2.3:a:jqlang:jq:1.2
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cpe:2.3:a:jqlang:jq:1.3
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cpe:2.3:a:jqlang:jq:1.4
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cpe:2.3:a:jqlang:jq:1.5
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cpe:2.3:a:jqlang:jq:1.6
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cpe:2.3:a:jqlang:jq:1.7
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cpe:2.3:a:jqlang:jq:1.7-37-g88f01a7
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cpe:2.3:a:jqlang:jq:1.7.1