jq: Wild stack write via signed-integer overflow in decNumber D2U() macro
CVE-2026-43894 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-43894, 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, when decNumberFromString is given a number literal of INT_MAX-1 (2147483646) digits, the D2U() macro overflows during signed-int arithmetic. The wrapped negative value bypasses the heap-allocation size check, causes the function to use a 30-byte stack buffer, and then writes ≈715 million 16-bit units (≈1.4 GiB) at an offset 1.43 GiB below the stack frame. The written content is fully attacker-controlled (the parsed decimal digits, packed 3-per-unit).
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| jq · Debian 12.15 (bookworm) | 1.6-2.1+deb12u2 | DEBIAN-CVE-2026-43894 | May 27, 2026 |
| jq · Debian 13.5 (trixie) | 1.7.1-6+deb13u3 | DEBIAN-CVE-2026-43894 | May 27, 2026 |
| jq · Debian 14 | 1.8.1-6 | DEBIAN-CVE-2026-43894 | May 27, 2026 |
| jq · amzn 2023 | 1.8.1-59.amzn2023 | ALAS2023-2026-1815 | Jun 8, 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 |
| jq-debuginfo · amzn 2023 | 1.8.1-59.amzn2023 | ALAS2023-2026-1815 | Jun 8, 2026 |
| jq-debugsource · amzn 2023 | 1.8.1-59.amzn2023 | ALAS2023-2026-1815 | Jun 8, 2026 |
| jq-devel · amzn 2023 | 1.8.1-59.amzn2023 | ALAS2023-2026-1815 | Jun 8, 2026 |
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