CVE-2019-20393

Name	CVE-2019-20393
Description	A double-free is present in libyang before v1.0-r1 in the function yyparse() when an empty description is used. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw, which would cause a crash or potentially code execution.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, 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
	sid, trixie	3.4.2+dfsg-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=1793930
https://github.com/CESNET/libyang/commit/d9feacc4a590d35dbc1af21caf9080008b4450ed
https://github.com/CESNET/libyang/issues/742