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.
Published: 2026-05-11
Score: 6.4 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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Advisories

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History

Thu, 14 May 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


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

Type Values Removed Values Added
CPEs cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}


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:

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 : Analyzed

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

Modified: 2026-05-13T17:01:01.423

Link: CVE-2026-41257

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-05-11T17:14:32Z

Links: CVE-2026-41257 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-05-11T20:00:15Z

Weaknesses