{"action":"Upgrade libyang to 1.0.176-1 or later.","affected":[{"fixed":"1.0.176-1","introduced":"0"}],"component":"libyang","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["1.0.176-1"],"id":"tcs_01M5NE4TAAE2AXY3NZR95KX1QY","modified_at":"2026-09-21T07:03:17.474199211Z","published_at":"2020-01-22T22:15:10.627Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2019-20398","https://security-tracker.debian.org/tracker/CVE-2019-20398"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2019-20398#Debian:14/libyang","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2019-20398"}],"summary":"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"}