CVE-2026-47770
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk2th percentile — higher than 2% of all known CVEs
Summary
The vulnerability in jq (versions prior to 1.8.2) allows a DoS attack via C stack exhaustion when comparing deeply nested arrays with the == operator. The issue stems from missing recursion guards in jvp_array_equal() and jv_equal() functions in src/jv.c.
Risk Assessment
An attacker can send specially crafted deeply nested JSON data, causing jq process crash and disrupting services relying on this tool.
Recommendation
Immediately update jq to version 1.8.2 or later. If update is not possible, restrict access to processing untrusted JSON data with jq.
Original NVD description (English source)
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.