vulnerability
Debian: CVE-2026-6786: firefox-esr -- security update
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 9 | (AV:N/AC:M/Au:N/C:C/I:C/A:C) | Apr 23, 2026 | Apr 23, 2026 | Apr 23, 2026 |
Severity
9
CVSS
(AV:N/AC:M/Au:N/C:C/I:C/A:C)
Published
Apr 23, 2026
Added
Apr 23, 2026
Modified
Apr 23, 2026
Description
Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Solution
debian-upgrade-firefox-esr
Rapid7 Labs
2026 Global Threat Landscape Report
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