{"action":"Upgrade libyang to 3.4.2+dfsg-2 or later.","affected":[{"fixed":"3.4.2+dfsg-2","introduced":"0"}],"component":"libyang","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["3.4.2+dfsg-2"],"id":"tcs_01M5NFHXYZ5MEMGZVR0MQTYNFV","modified_at":"2026-10-23T18:03:57.554541899Z","published_at":"2021-05-20T19:15:07.747Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-28906","https://security-tracker.debian.org/tracker/CVE-2021-28906"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-28906#Debian:14/libyang","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-28906"}],"summary":"In function read_yin_leaf() in libyang <= v1.0.225, it doesn't check whether the value of retval->ext[r] is NULL. In some cases, it can be NULL, which leads to the operation of retval->ext[r]->flags t"}