CVE-2026-43894
Last modified
CVE-2026-43894 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.16% chance of exploitation in the next 30 days.
Description
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).
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Jqlang | Jq | <= 1.8.1 |
References
- https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4gExploit, Mitigation, Vendor Advisory
- https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4gExploit, Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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