jq: stack overflow in deep structural equality_CVE-2026-47770

6.8 / 10

MEDIUM

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

Description

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.

Basic Information

ID CVE-2026-47770

Source GitHub_M

Published Jun 25, 2026 at 17:22

Affected Product

Vendor jqlang

Product jq

Version < 1.8.2

Affected Versions jqlang jq < 1.8.2

CWE Classification

CWE-674

References

github.com /jqlang/jq/security/advisories/GHSA-3pgx-frr7-3jxp

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