Description
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).
Published: 2026-05-11
Score: 6.2 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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History

Wed, 13 May 2026 17:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:*

Tue, 12 May 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 11 May 2026 20:00:00 +0000

Type Values Removed Values Added
First Time appeared Jqlang
Jqlang jq
Vendors & Products Jqlang
Jqlang jq

Mon, 11 May 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 11 May 2026 18:00:00 +0000

Type Values Removed Values Added
Description 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).
Title jq: Wild stack write via signed-integer overflow in decNumber D2U() macro
Weaknesses CWE-190
References
Metrics cvssV3_1

{'score': 6.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-11T18:32:43.668Z

Reserved: 2026-05-04T15:17:09.330Z

Link: CVE-2026-43894

cve-icon Vulnrichment

Updated: 2026-05-11T18:32:39.507Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-11T18:16:37.250

Modified: 2026-05-13T17:01:10.463

Link: CVE-2026-43894

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-05-11T17:20:06Z

Links: CVE-2026-43894 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-05-11T19:45:08Z

Weaknesses