{"action":"Upgrade thunderbird to 1:91.3.0-1 or later.","affected":[{"fixed":"1:91.3.0-1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["1:91.3.0-1"],"id":"tcs_01M5NG1HM2F3W9EBVAQ2S1EJMG","modified_at":"2026-10-23T18:04:50.054116701Z","published_at":"2021-12-08T22:15:09.517Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-43535","https://security-tracker.debian.org/tracker/CVE-2021-43535"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-43535#Debian:12/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-43535"}],"summary":"A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefo"}