{"action":"Upgrade firefox-esr to 91.4.0esr-1 or later.","affected":[{"fixed":"91.4.0esr-1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["91.4.0esr-1"],"id":"tcs_01M5NG1KCE2SYM1KFTT4MT37RH","modified_at":"2026-10-23T18:04:16.598403413Z","published_at":"2021-12-08T22:15:09.730Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-43539","https://security-tracker.debian.org/tracker/CVE-2021-43539"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-43539#Debian:14/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-43539"}],"summary":"Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC occurring within the call not tracing those live pointers. This could have led to a use-after-free"}