{"action":"Upgrade thunderbird to 91.3.2-r0 or later.","affected":[{"fixed":"91.3.2-r0","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Alpine","ecosystem_qualifier":"Alpine:v3.16","exploited":false,"fixed_versions":["91.3.2-r0"],"id":"tcs_01M6GYXYRYV6BYGGVCFN1KPPYM","modified_at":"2026-11-03T06:32:47.041863819Z","published_at":"2021-11-03T01:15:07.060Z","references":["https://osv.dev/vulnerability/ALPINE-CVE-2021-29991","https://security.alpinelinux.org/vuln/CVE-2021-29991"],"severity":{"label":"high","score":8.1},"sources":[{"source":"osv","source_id":"ALPINE-CVE-2021-29991#Alpine:v3.16/thunderbird","url":"https://osv.dev/vulnerability/ALPINE-CVE-2021-29991"}],"summary":"Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers. This allowed for a header splitting attack against servers using HTTP/3. This vulnerability affects"}