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CVE-2026-47770— jq: stack overflow in deep structural equality

Quick assessment

Affected
jqlang jq
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

jqlang jq是jqlang团队开源的一个轻量级且灵活的命令行 JSON 处理器。 jqlang jq 1.8.2之前版本存在资源管理错误漏洞，该漏洞源于使用==运算符比较深度嵌套数组时缺乏递归保护，导致C栈耗尽，容易受到拒绝服务攻击。

AI Predicted 5.3 Difficulty: Easy EPSS 0.16% · P4

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
jqlang jq < 1.8.2 affected
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I. Basic Information for CVE-2026-47770

Vulnerability Information
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Vulnerability Title
jq: stack overflow in deep structural equality
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
jqlang jq 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
jqlang jq是jqlang团队开源的一个轻量级且灵活的命令行 JSON 处理器。 jqlang jq 1.8.2之前版本存在资源管理错误漏洞，该漏洞源于使用==运算符比较深度嵌套数组时缺乏递归保护，导致C栈耗尽，容易受到拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jqlang jq < 1.8.2 -

II. Public POCs for CVE-2026-47770

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III. Intelligence Information for CVE-2026-47770

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Vendor Advisories for CVE-2026-47770 (1)

Same Patch Batch · jqlang · 2026-06-25 · 3 CVEs total

CVE-2026-49839 7.1 HIGH jq --rawfile invalid-state reuse after String too long causes heap-buffer-overflow
CVE-2026-54679 jq: potential integer overflow in jvp_string_append

IV. Related Vulnerabilities

Same product: jq
Same vendor: jqlang
Same weakness: CWE-674

V. Comments for CVE-2026-47770

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