Debian/firefox-esr: critical 9.6
Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbir
Action: Upgrade firefox-esr to 140.15.0esr-1 or later.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 140.15.0esr-1 | - |
Fixed versions
| 140.15.0esr-1 |
Sources
- osv: DEBIAN-CVE-2026-84121#Debian:14/firefox-esr
- https://security-tracker.debian.org/tracker/CVE-2026-84121
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