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CVE-2026-40164— jq: Algorithmic complexity DoS via hardcoded MurmurHash3 seed

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.

jq是jqlang开源的一个轻量级且灵活的命令行 JSON 处理器。 jq存在安全漏洞，该漏洞源于使用硬编码公开种子的MurmurHash3算法，可能导致攻击者通过提供特制JSON对象造成CPU耗尽。

CVSS 7.5 · High EPSS 0.59% · P47

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
jqlang jq < 0c7d133c3c7e37c00b6d46b658a02244fdd3c784 affected
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I. Basic Information for CVE-2026-40164

Vulnerability Information
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Vulnerability Title
jq: Algorithmic complexity DoS via hardcoded MurmurHash3 seed
Source: CVE Program / CVE List V5
Vulnerability Description
jq is a command-line JSON processor. Before commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784, jq used MurmurHash3 with a hardcoded, publicly visible seed (0x432A9843) for all JSON object hash table operations, which allowed an attacker to precompute key collisions offline. By supplying a crafted JSON object (~100 KB) where all keys hashed to the same bucket, hash table lookups degraded from O(1) to O(n), turning any jq expression into an O(n²) operation and causing significant CPU exhaustion. This affected common jq use cases such as CI/CD pipelines, web services, and data processing scripts, and was far more practical to exploit than existing heap overflow issues since it required only a small payload. This issue has been patched in commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可逆的单向哈希
Source: CVE Program / CVE List V5
Vulnerability Title
jq 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
jq是jqlang开源的一个轻量级且灵活的命令行 JSON 处理器。 jq存在安全漏洞，该漏洞源于使用硬编码公开种子的MurmurHash3算法，可能导致攻击者通过提供特制JSON对象造成CPU耗尽。
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 < 0c7d133c3c7e37c00b6d46b658a02244fdd3c784 -

II. Public POCs for CVE-2026-40164

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III. Intelligence Information for CVE-2026-40164

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Patches & Fixes for CVE-2026-40164 (1)

Vendor Advisories for CVE-2026-40164 (1)

Same Patch Batch · jqlang · 2026-04-13 · 6 CVEs total

CVE-2026-32316 8.2 HIGH jq: Integer overflow in jvp_string_append() allows Heap-based Buffer Overflow
CVE-2026-33947 6.2 MEDIUM jq: Unbounded Recursion in jv_setpath(), jv_getpath() and delpaths_sorted()
CVE-2026-39956 6.1 MEDIUM jq: Missing runtime type checks for _strindices lead to crash and limited memory disclosur
CVE-2026-39979 jq: Out-of-Bounds Read in jv_parse_sized() Error Formatting for Non-NUL-Terminated Counted
CVE-2026-33948 jq: Embedded-NUL Truncation in CLI JSON Input Path Causes Prefix-Only Validation of Malfor

IV. Related Vulnerabilities

Same product: jq
Same vendor: jqlang
Same weakness: CWE-328

V. Comments for CVE-2026-40164

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