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CVE-2026-39956— jq: Missing runtime type checks for _strindices lead to crash and limited memory disclosure

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_strindices内置函数未验证参数类型，可能导致崩溃或受控指针取消引用。

CVSS 6.1 · Medium EPSS 0.17% · P5

Affected Version Matrix 1

VendorProduct Version RangeStatus
jqlang jq < 1.8.2 affected
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I. Basic Information for CVE-2026-39956

Vulnerability Information
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Vulnerability Title
jq: Missing runtime type checks for _strindices lead to crash and limited memory disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
jq is a command-line JSON processor. Prior to version 1.8.2, the _strindices builtin in jq's src/builtin.c passes its arguments directly to jv_string_indexes() without verifying they are strings, and jv_string_indexes() in src/jv.c relies solely on assert() checks that are stripped in release builds compiled with -DNDEBUG. This allows an attacker to crash jq trivially with input like _strindices(0), and by crafting a numeric value whose IEEE-754 bit pattern maps to a chosen pointer, achieve a controlled pointer dereference and limited memory read/probe primitive. Any deployment that evaluates untrusted jq filters against a release build is vulnerable. This issue has been patched in commit fdf8ef0f0810e3d365cdd5160de43db46f57ed03, which is part of version 1.8.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
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_strindices内置函数未验证参数类型，可能导致崩溃或受控指针取消引用。
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-2026-39956

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III. Intelligence Information for CVE-2026-39956

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Vendor Advisories for CVE-2026-39956 (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-2026-40164 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-2026-39979 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-125

V. Comments for CVE-2026-39956

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