CVE-2026-4729
Critical · 9.8CVSS
9.8
EPSS
0.5%
Published
Mar 24, 2026
CISA due date
—
The record
Memory safety bugs present in Firefox 148 and Thunderbird 148. 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 and Thunderbird 149.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Chainguard | firefox | 0 | 149.0-r0 |
| Wolfi | firefox | 0 | 149.0-r0 |
| openSUSE:Tumbleweed | MozillaFirefox | 0 | 149.0-1.1 |
Related vulnerabilities
- CVE-2026-4726 Denial-of-service in the XML component. Also affects firefox
- CVE-2026-4724 Undefined behavior in the Audio/Video component. Also affects firefox
- CVE-2026-4722 Privilege escalation in the IPC component. Also affects firefox
- CVE-2026-4723 Use-after-free in the JavaScript Engine component. Also affects firefox
- CVE-2026-4727 Denial-of-service in the Libraries component in NSS. Also affects firefox
- CVE-2026-4728 Spoofing issue in the Privacy: Anti-Tracking component. Also affects firefox
- CVE-2026-4725 Sandbox escape due to use-after-free in the Graphics: Canvas2D component. Also affects firefox
- CVE-2026-4716 Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component. Also affects firefox