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.
Metrics
CVSS 3.1 5.5/10
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| jqlang | jq | <= 1.8.1 |
References
- https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539Exploit, Mitigation, Vendor Advisory
- https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539Exploit, Mitigation, Vendor Advisory
Timeline
- Published
- May 11, 2026
- Last modified
- Oct 26, 2026
- NVD status
- Analyzed