CVE-2019-20398

Name	CVE-2019-20398
Description	A NULL pointer dereference is present in libyang before v1.0-r3 in the function lys_extension_instances_free() due to a copy of unresolved extensions in lys_restr_dup(). Applications that use libyang to parse untrusted input yang files may crash.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3572-1

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	fixed
	trixie	3.12.2-1	fixed
	forky, sid	3.13.5-2	fixed

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

Package	Type	Release	Fixed Version	Origin
libyang	source	experimental	1.0.167-1
libyang	source	buster	0.16.105+really1.0-0+deb10u1	DLA-3572-1
libyang	source	(unstable)	1.0.176-1

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=1793935
https://github.com/CESNET/libyang/commit/7852b272ef77f8098c35deea6c6f09cb78176f08
https://github.com/CESNET/libyang/issues/773