CVE-2026-43894

jq is a command-line JSON processor. In 1.8.1 and earlier, when decNumberFromString is given a number literal of INT_MAX-1 (2147483646) digits, the D2U() macro overflows during signed-int arithmetic. The wrapped negative value bypasses the heap-allocation size check, causes the function to use a 30-byte stack buffer, and then writes ≈715 million 16-bit units (≈1.4 GiB) at an offset 1.43 GiB below the stack frame. The written content is fully attacker-controlled (the parsed decimal digits, packed 3-per-unit).

CVSS v3 6.2 MEDIUM

6.2^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.5 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4g	Exploit Mitigation Vendor Advisory
https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4g	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
CPE		cpe:2.3:a:jqlang:jq::::::::
First Time		Jqlang jq Jqlang
References	~~() https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4g -~~	() https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4g - Exploit, Mitigation, Vendor Advisory

11 May 2026, 20:25

Type	Values Removed	Values Added
References	~~() https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4g -~~	() https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4g -

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-2026-43894

Mitre link : CVE-2026-43894

CVE.ORG link : CVE-2026-43894

JSON object : View

Products Affected

jqlang

jq

CWE

CWE-190

Integer Overflow or Wraparound

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