{"id":"CVE-2019-20398","details":"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.","modified":"2026-05-17T11:55:18.307760592Z","published":"2020-01-22T22:15:10.627Z","database_specific":{},"references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html"},{"type":"ADVISORY","url":"https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3"},{"type":"FIX","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1793935"},{"type":"FIX","url":"https://github.com/CESNET/libyang/commit/7852b272ef77f8098c35deea6c6f09cb78176f08"},{"type":"EVIDENCE","url":"https://github.com/CESNET/libyang/issues/773"}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}