Debian/firefox-esr: high 8.6
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and T
Action: Upgrade firefox-esr to 140.9.0esr-1 or later.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 140.9.0esr-1 | - |
Fixed versions
| 140.9.0esr-1 |
Sources
- osv: DEBIAN-CVE-2026-4690#Debian:14/firefox-esr
- https://security-tracker.debian.org/tracker/CVE-2026-4690
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