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.
History

Mon, 11 May 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 11 May 2026 19:45:00 +0000

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

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, 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.
Title jq: Signed-int overflow in `stack_reallocate` (jq VM stack)
Weaknesses CWE-190
CWE-787
References
Metrics cvssV4_0

{'score': 6.4, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-05-11T17:14:32.579Z

Updated: 2026-05-11T19:25:59.800Z

Reserved: 2026-04-18T14:01:46.801Z

Link: CVE-2026-41257

cve-icon Vulnrichment

Updated: 2026-05-11T19:25:46.119Z

cve-icon NVD

Status : Received

Published: 2026-05-11T18:16:34.127

Modified: 2026-05-11T20:25:41.877

Link: CVE-2026-41257

cve-icon Redhat

No data.