Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-41257— jq: Signed-int overflow in `stack_reallocate` (jq VM stack)

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jq字节码虚拟机数据栈分配大小使用有符号整数，当栈增长超过约1 GiB时，倍增算术溢出，可能导致传递给realloc的包装值被用于攻击者影响偏移量的memmove操作。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
jqlang jq <= 1.8.1 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-41257

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
jq: Signed-int overflow in `stack_reallocate` (jq VM stack)
Source: CVE Program / CVE List V5
Vulnerability Description
jq is a command-line JSON processor. In 1.8.1 and earlier, the jq bytecode VM's data stack tracks its allocation size in a signed int. When the stack grows beyond ≈1 GiB (via deeply nested generator forks), the doubling arithmetic overflows. The wrapped value is passed to realloc and then used for a memmove with attacker-influenced offsets.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
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jq字节码虚拟机数据栈分配大小使用有符号整数，当栈增长超过约1 GiB时，倍增算术溢出，可能导致传递给realloc的包装值被用于攻击者影响偏移量的memmove操作。
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 <= 1.8.1 -

II. Public POCs for CVE-2026-41257

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-41257

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-41257 (1)

Same Patch Batch · jqlang · 2026-05-11 · 7 CVEs total

CVE-2026-43896 6.2 MEDIUM jq: Stack Overflow in Recursive Object Merge
CVE-2026-43894 6.2 MEDIUM jq: Wild stack write via signed-integer overflow in decNumber D2U() macro
CVE-2026-41256 5.5 MEDIUM jq: Embedded NUL truncates top-level jq programs loaded with -f
CVE-2026-43895 4.4 MEDIUM jq: Embedded NUL in jq import paths causes local redaction-policy bypass and preserves sen
CVE-2026-40612 jq: Stack overflow via unbounded recursion in jv_contains
CVE-2026-44777 jq: stack overflow in module loading on mutual `include`

IV. Related Vulnerabilities

Same product: jq
Same vendor: jqlang
Same weakness: CWE-190

V. Comments for CVE-2026-41257

No comments yet

Leave a comment