{"action":"Upgrade thunderbird to 1:140.9.0esr-1 or later.","affected":[{"fixed":"1:140.9.0esr-1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["1:140.9.0esr-1"],"id":"tcs_01M5NS6CSWW2TMHBTT4PYPWFFX","modified_at":"2026-10-01T03:03:14.035718724Z","published_at":"2026-03-24T21:16:29.583Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-4371","https://security-tracker.debian.org/tracker/CVE-2026-4371"],"severity":{"label":"high","score":7.4},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-4371#Debian:14/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-4371"}],"summary":"A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an a"}