CVE-2026-41257
jq: Signed-int overflow in `stack_reallocate` (jq VM stack)
- State
- Published
- Severity
- 6.4 Medium
- Published
- May 11, 2026
- Updated
- May 11, 2026
- Reserved
- Apr 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.4 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 | GitHub_M |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
jqjqlang |
|
References
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