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Vulnerability record · public intelligence
CVE-2026-109753
HIGH
Incorrect boundary conditions in the Layout component
Published Oct 13, 2026 · Updated Nov 3, 2026
Severity · CVSSHIGH · Not scored
Known exploitationNot listed
EPSS / likelihood0.34%
QFinch risk scoreNot available
Original summary
Normalized public record · Updated Nov 3, 2026
Incorrect boundary conditions in the Layout component
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
Incorrect boundary conditions in the Layout component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
FIRST-EPSSCVE-LIST-V5
- SSVC priority
- MEDIUM
- Confidence
- Not available
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
- bugzilla.mozilla.org ↗
- Security advisory ↗
- Security advisory ↗
- Security advisory ↗
- Security advisory ↗
- Security advisory ↗
Record history
Published Oct 13, 2026 · Last refreshed Nov 3, 2026