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CVE-2026-32316— jq: Integer overflow in jvp_string_append() allows Heap-based Buffer Overflow

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 1.8.1及之前版本存在输入验证错误漏洞，该漏洞源于jvp_string_append和jvp_string_copy_replace_bad函数存在整数溢出，可能导致堆缓冲区溢出。

CVSS 8.2 · High EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-32316

Vulnerability Information
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Vulnerability Title
jq: Integer overflow in jvp_string_append() allows Heap-based Buffer Overflow
Source: CVE Program / CVE List V5
Vulnerability Description
jq is a command-line JSON processor. An integer overflow vulnerability exists through version 1.8.1 within the jvp_string_append() and jvp_string_copy_replace_bad functions, where concatenating strings with a combined length exceeding 2^31 bytes causes a 32-bit unsigned integer overflow in the buffer allocation size calculation, resulting in a drastically undersized heap buffer. Subsequent memory copy operations then write the full string data into this undersized buffer, causing a heap buffer overflow classified as CWE-190 (Integer Overflow) leading to CWE-122 (Heap-based Buffer Overflow). Any system evaluating untrusted jq queries is affected, as an attacker can crash the process or potentially achieve further exploitation through heap corruption by crafting queries that produce extremely large strings. The root cause is the absence of string size bounds checking, unlike arrays and objects which already have size limits. The issue has been addressed in commit e47e56d226519635768e6aab2f38f0ab037c09e5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
jq 输入验证错误漏洞
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 1.8.1及之前版本存在输入验证错误漏洞，该漏洞源于jvp_string_append和jvp_string_copy_replace_bad函数存在整数溢出，可能导致堆缓冲区溢出。
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 < e47e56d226519635768e6aab2f38f0ab037c09e5 -

II. Public POCs for CVE-2026-32316

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III. Intelligence Information for CVE-2026-32316

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Patches & Fixes for CVE-2026-32316 (1)

Vendor Advisories for CVE-2026-32316 (1)

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

CVE-2026-40164 7.5 HIGH jq: Algorithmic complexity DoS via hardcoded MurmurHash3 seed
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-122

V. Comments for CVE-2026-32316

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