PT-2026-27398 · Mozilla+1 · Thunderbird+3
Matej Smycka
·
Published
2026-01-01
·
Updated
2026-04-17
·
CVE-2026-4699
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Firefox versions prior to 149
Firefox ESR versions prior to 115.34
Firefox ESR versions prior to 140.9
Thunderbird versions prior to 149
Thunderbird versions prior to 140.9
Description
The issue involves incorrect boundary conditions within the Layout: Text and Fonts component. This could potentially lead to unexpected behavior or instability when processing text and fonts.
Recommendations
Update Firefox to version 149 or later.
Update Firefox ESR to version 115.34 or later.
Update Firefox ESR to version 140.9 or later.
Update Thunderbird to version 149 or later.
Update Thunderbird to version 140.9 or later.
Fix
Improper Check for Exceptional Conditions
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Weakness Enumeration
Related Identifiers
Affected Products
Firefox
Firefox Esr
Rocky Linux
Thunderbird