CVE-2026-44673

Name	CVE-2026-44673
Description	libyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parser_lyb.c contains an integer overflow that results in a heap buffer overflow when parsing a maliciously crafted LYB binary blob. An attacker who can supply LYB data to any libyang consumer (NETCONF server, sysrepo, etc.) can trigger a crash or potential heap corruption. This vulnerability is fixed in SO 5.2.15.
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
libyang (PTS)	bullseye	1.0.225-1.1	vulnerable
	trixie	3.12.2-1	vulnerable
	forky, sid	3.13.6-1	vulnerable
libyang2 (PTS)	bookworm	2.1.30-2	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libyang	source	(unstable)	(unfixed)
libyang2	source	(unstable)	(unfixed)

https://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh