PT-2026-39718 · Jqlang · Jq

Published 2026-05-11 · Updated 2026-05-11 · CVE-2026-43894

Mitre

CVSS v3.1

6.2

Medium

Base vector

AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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).

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2026-43894

Affected Products

Jq

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-43894 · Security Note
• https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4g · Note