Vulnerability Details CVE-2026-43894
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).
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 2.9%
CVSS Severity
CVSS v3 Score 6.2
References
Products affected by CVE-2026-43894
-
cpe:2.3:a:jqlang:jq:1.0
-
cpe:2.3:a:jqlang:jq:1.1
-
cpe:2.3:a:jqlang:jq:1.2
-
cpe:2.3:a:jqlang:jq:1.3
-
cpe:2.3:a:jqlang:jq:1.4
-
cpe:2.3:a:jqlang:jq:1.5
-
cpe:2.3:a:jqlang:jq:1.6
-
cpe:2.3:a:jqlang:jq:1.7
-
cpe:2.3:a:jqlang:jq:1.7-37-g88f01a7
-
cpe:2.3:a:jqlang:jq:1.7.1