Windows apps · Application version · April 7, 2026

Mozilla Firefox (en-US) 149.0.2

Mozilla Firefox (en-US) 149.0.2, released April 7, 2026, fixes 4 CVEs in Mozilla Firefox (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every one of these CVEs.

Urgent

Superseded. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every CVE on this page. Install that instead.

CVEs closed
4
1 rated Critical
Exploited
0
None reported
Highest CVSS
9.8
Base score, 0 to 10
Highest EPSS
0.0036
30th percentile

Priority of the 4 CVEs

Patch now 0 Urgent 1 High 3 Routine 0

Applies to

ProductVersion
Mozilla Firefox (en-US)149.0.2

CVEs this fix closes

PriorityCVETitleCVSSEPSSExploitation
Urgent CVE-2026-5735 Memory safety bugs fixed in Firefox 149.0.2 and Thunderbird 149.0.29.8 0.0027 None reported
High CVE-2026-5732 Incorrect boundary conditions, integer overflow in the Graphics: Text component8.8 0.0036 None reported
High CVE-2026-5734 Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.29.8 0.0034 None reported
High CVE-2026-5733 Incorrect boundary conditions in the Graphics: WebGPU component8.8 0.0032 None reported
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