Sandbox escape due to uninitialized memory in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Critical 9.6
CVE-2026-109745
Mozilla Firefox — This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird…
This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
WeaknessCWE-908
Published Updated Source NVD
CVSS 3.1
9.6
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Exploit chance, 30 days
0.3%
Higher than 28% of all CVEs (EPSS)
Status
No known exploitation
Not in CISA KEV
Patch
Unknown
Check the vendor advisory
What happened
What to do
- 01Check whether you run Mozilla Firefox, and which version.
- 02Follow the vendor advisory for a fix or a workaround.
References
Timeline · UTC
- Published to NVD
- NVD record updated
Also actively exploited
Other CVEs in Mozilla Firefox
12 more CVEs
9.8Mozilla Firefox — integer overflow.EPSS 0.5%9.1Mozilla Firefox — Same-origin policy bypass in the DevTools component.EPSS 0.2%9.8Mozilla Firefox — This vulnerability was fixed in Firefox 158 and Thunderbird 158.EPSS 0.3%9.8Mozilla Firefox — Mitigation bypass in the DOM: Core & HTML component.EPSS 0.4%9.6Mozilla Firefox — This vulnerability was fixed in Firefox 158 and Thunderbird 158.EPSS 0.3%9.6Mozilla Firefox — missing authorization.EPSS 0.4%