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CVE-2026-0891

🔴 HIGH

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...

Published
Jan 13, 2026
Last Modified
Jan 15, 2026
Views
11
Bookmarks
0

Description

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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. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

CVSS Scores

CVSS 3.1 8.1
8.1
HIGH
CVSS 2.0 8.1

References

bugzilla.mozilla.org www.mozilla.org www.mozilla.org www.mozilla.org www.mozilla.org

Additional Information

Source
security@mozilla.org
State
Undergoing analysis

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