{"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:14","exploited":false,"fixed_versions":["1:78.5.0-1"],"id":"tcs_01M5NEXP29CVMJ531PBC6BB5X9","modified_at":"2026-09-11T11:02:31.327859147Z","published_at":"2020-12-09T01:15:13.283Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2020-26961","https://security-tracker.debian.org/tracker/CVE-2020-26961"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2020-26961#Debian:14/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2020-26961"}],"summary":"When DNS over HTTPS is in use, it intentionally filters RFC1918 and related IP ranges from the responses as these do not make sense coming from a DoH resolver. However when an IPv4 address was mapped"}