CVE-2026-41257

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.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539	Exploit Mitigation Vendor Advisory
https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:*

History

13 May 2026, 17:01

Type	Values Removed	Values Added
First Time		Jqlang jq Jqlang
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.5
References	~~() https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539 -~~	() https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539 - Exploit, Mitigation, Vendor Advisory
CPE		cpe:2.3:a:jqlang:jq::::::::

11 May 2026, 20:25

Type	Values Removed	Values Added
References	~~() https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539 -~~	() https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539 -

11 May 2026, 18:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-11 18:16

Updated : 2026-05-13 17:01

NVD link : CVE-2026-41257

Mitre link : CVE-2026-41257

CVE.ORG link : CVE-2026-41257

JSON object : View

Products Affected

jqlang

jq

CWE

CWE-190

Integer Overflow or Wraparound

CWE-787

Out-of-bounds Write

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