{"action":"Upgrade firefox-esr to 115.6.0esr-1 or later.","affected":[{"fixed":"115.6.0esr-1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["115.6.0esr-1"],"id":"tcs_01M5NJZPTW8JZRTPB34ZEYYC40","modified_at":"2026-10-26T18:02:21.432617192Z","published_at":"2023-12-19T14:15:07.420Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2023-6858","https://security-tracker.debian.org/tracker/CVE-2023-6858"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2023-6858#Debian:13/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2023-6858"}],"summary":"Firefox was susceptible to a heap buffer overflow in `nsTextFragment` due to insufficient OOM handling. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121."}