jq: Signed-int overflow in `stack_reallocate` (jq VM stack)_CVE-2026-41257

6.4 / 10

MEDIUM

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

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.

Basic Information

ID CVE-2026-41257

Source GitHub_M

Published May 11, 2026 at 17:14

Affected Product

Vendor jqlang

Product jq

Version <= 1.8.1

Affected Versions jqlang jq <= 1.8.1

CWE Classification

CWE-190 CWE-787

References

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

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    "published": "2026-05-11T17:14:32.579Z",
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