CVE-2026-123202

Name	CVE-2026-123202
Description	libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.
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)
Debian Bugs	1153280

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libnxml (PTS)	bookworm	0.18.4-1	vulnerable
	trixie	0.18.5-1	vulnerable
	forky, sid	0.18.5-2	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libnxml	source	(unstable)	(unfixed)			1153280

Fixed by: https://github.com/bakulf/libnxml/commit/fbac242374883edf2ec14127ca6d2accf4704b6a (0.18.6)