{"action":"Upgrade thunderbird to 1:78.5.0-1 or later.","affected":[{"fixed":"1:78.5.0-1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["1:78.5.0-1"],"id":"tcs_01M5NEXMD3VJH4JBMEQNFMWSX4","modified_at":"2026-09-11T11:02:31.176000855Z","published_at":"2020-12-09T01:15:13.143Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2020-26959","https://security-tracker.debian.org/tracker/CVE-2020-26959"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2020-26959#Debian:12/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2020-26959"}],"summary":"During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerabili"}