vulnerability
MFSA2026-01 Firefox: Security Vulnerabilities fixed in Firefox 147 (CVE-2026-0891)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 9 | (AV:N/AC:M/Au:N/C:C/I:C/A:C) | Jan 13, 2026 | Jan 14, 2026 | Jan 14, 2026 |
Severity
9
CVSS
(AV:N/AC:M/Au:N/C:C/I:C/A:C)
Published
Jan 13, 2026
Added
Jan 14, 2026
Modified
Jan 14, 2026
Description
Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. 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.
Solution
mozilla-firefox-upgrade-147_0
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