CVE-2026-43894

Name	CVE-2026-43894
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).
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
jq (PTS)	bullseye	1.6-2.1	vulnerable
	bullseye (security)	1.6-2.1+deb11u1	vulnerable
	bookworm	1.6-2.1+deb12u1	vulnerable
	trixie	1.7.1-6+deb13u1	vulnerable
	forky, sid	1.8.1-5	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
jq	source	(unstable)	(unfixed)

https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4g