PT-2026-39711 · Jqlang · Jq

Published 2026-05-11 · Updated 2026-05-11 · CVE-2026-41257

NVD

CVSS v4.0

6.4

Medium

Base vector

AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Fix

Memory Corruption

Integer Overflow

Weakness Enumeration

CWE-787

CWE-190

Related Identifiers

CVE-2026-41257

Affected Products

Jq

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-41257 · Security Note
• https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539 · Note