CVE-2026-6042

Name	CVE-2026-6042
Description	A security flaw has been discovered in musl libc up to 1.2.6. Affected is the function iconv of the file src/locale/iconv.c of the component GB18030 4-byte Decoder. Performing a manipulation results in inefficient algorithmic complexity. The attack must be initiated from a local position. To fix this issue, it is recommended to deploy a patch.
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
musl (PTS)	bullseye	1.2.2-1	vulnerable
	bookworm	1.2.3-1	vulnerable
	forky, sid, trixie	1.2.5-3	vulnerable

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

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

Notes

https://www.openwall.com/lists/oss-security/2026/04/02/10
https://www.openwall.com/lists/oss-security/2026/04/03/2
Fixed by: https://git.musl-libc.org/cgit/musl/commit/?id=67219f0130ec7c876ac0b299046460fad31caabf