CVE-2026-5735
Critical · 9.8CVSS
9.8
EPSS
0.5%
Published
Apr 7, 2026
CISA due date
—
The record
Memory safety bugs present in Firefox 149.0.1 and Thunderbird 149.0.1. 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 149.0.2 and Thunderbird 149.0.2.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Tumbleweed | MozillaFirefox | 0 | 149.0.2-1.1 |
Related vulnerabilities
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- CVE-2026-12318 Incorrect boundary conditions in the Libraries component in NSS. Also affects MozillaFirefox
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