CVE-2026-41257

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 Reserved 2026-04-18 | Published 2026-05-11 | Updated 2026-05-11 | Assigner GitHub_M

Problem types

CWE-190: Integer Overflow or Wraparound

CWE-787: Out-of-bounds Write

Product status

References

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

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

cve.org (CVE-2026-41257)

nvd.nist.gov (CVE-2026-41257)

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