Medium severity6.5NVD Advisory· Published Jan 22, 2020· Updated Jun 17, 2026
CVE-2019-20398
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
15cpe:2.3:a:cesnet:libyang:0.11:r1:*:*:*:*:*:*+ 13 more
- cpe:2.3:a:cesnet:libyang:0.11:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.11:r2:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.12:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.12:r2:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.13:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.13:r2:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.14:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.15:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.16:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.16:r2:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.16:r3:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0:r2:*:*:*:*:*:*
- (no CPE)range: <1.0-r3
- libyang/libyangdescription
Patches
Vulnerability mechanics
References
5- bugzilla.redhat.com/show_bug.cginvdIssue TrackingPatchThird Party Advisory
- github.com/CESNET/libyang/commit/7852b272ef77f8098c35deea6c6f09cb78176f08nvdPatch
- github.com/CESNET/libyang/issues/773nvdExploitThird Party Advisory
- github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3nvdThird Party Advisory
- lists.debian.org/debian-lts-announce/2023/09/msg00019.htmlnvd
News mentions
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