Integer overflow in jq - CVE-2026-41257

Vulnerability identifier: #VU127879

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-41257

CWE-ID: CWE-190

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to integer overflow in stack_reallocate in the jq VM stack when processing deeply nested generator forks. A local user can supply crafted jq input to trigger signed integer overflow and abort the process to cause a denial of service.

In the observed case, the wrapped allocation size causes memory allocation failure and process abort. A small positive truncation may also lead to a wild memmove write before the buffer.

jq
Debian Linux
openEuler
Anolis OS
Fedora
LANTIME Operating System Firmware (LTOS)
jq (Debian package)
jq-help
jq-devel
jq-debugsource
jq-debuginfo
jq
jq-doc

Install update from vendor's website.

jq - update to 1.8.2
LANTIME Operating System Firmware (LTOS) - update to 7.10.013
jq (Debian package) - update to 1.7.1-6+deb13u3
jq-help - update to 1.8.0-4
jq-devel - update to 1.8.0-4
jq-debugsource - update to 1.8.0-4
jq-debuginfo - update to 1.8.0-4
jq - update to 1.8.0-4
jq - update to 1.8.1-8
jq-doc - update to 1.8.1-8
jq-devel - update to 1.8.1-8
jq - update to 1.8.2-4.fc45

• https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539

• Multiple vulnerabilities in jq
• Anolis OS update for jq
• Multiple vulnerabilities in Meinberg LANTIME firmware
• Debian update for jq
• Fedora 45 update for jq
• openEuler 24.03 LTS SP3 update for jq
• openEuler 24.03 LTS update for jq
• openEuler 22.03 LTS SP4 update for jq
• openEuler 20.03 LTS SP4 update for jq
• openEuler 24.03 LTS SP1 update for jq