{"action":"Upgrade thunderbird to 1:78.6.0-1 or later.","affected":[{"fixed":"1:78.6.0-1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["1:78.6.0-1"],"id":"tcs_01M5NEXSWYFAZ38FQNPEFZ99WW","modified_at":"2026-09-11T11:02:43.969370152Z","published_at":"2021-01-07T14:15:12Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2020-26974","https://security-tracker.debian.org/tracker/CVE-2020-26974"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2020-26974#Debian:12/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2020-26974"}],"summary":"When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potent"}