CVE-2026-109714
Firefox: Incorrect boundary conditions in the Layout component
Mozilla FirefoxApplications & CMS
CVSS
5.4MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.21%Chance of exploitation activity in the next 30 days, higher than 10% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
Description
Incorrect boundary conditions in the Layout component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
Text from CVE List
Affected versions 2
- Firefoxunaffected: 158CVE List
- Thunderbirdunaffected: 158CVE List