jq: Signed-int overflow in `stack_reallocate` (jq VM stack)
CVE-2026-41257 is fixed in jq on 1 platform, first by DEBIAN-CVE-2026-41257, released May 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| jq · Debian 12.15 (bookworm) | 1.6-2.1+deb12u2 | DEBIAN-CVE-2026-41257 | May 27, 2026 |
| jq · Debian 13.5 (trixie) | 1.7.1-6+deb13u3 | DEBIAN-CVE-2026-41257 | May 27, 2026 |
| jq · Debian 14 | 1.8.1-6 | DEBIAN-CVE-2026-41257 | May 27, 2026 |
| jq · opensuse-leap 16.0 | 1.7.1-160000.3.1 | OPENSUSE-SU-2026:21248-1 | Jul 7, 2026 |
| jq · sles 15.6 | 1.7.1-150000.3.25.1 | SUSE-SU-2026:4275-1 | Sep 21, 2026 |
| jq · sles 15.7 | 1.7.1-150000.3.25.1 | SUSE-SU-2026:4275-1 | Sep 21, 2026 |
| jq · sles 16.0 | 1.7.1-160000.3.1 | SUSE-SU-2026:22566-1 | Jul 7, 2026 |
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