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CVE-2026-109753 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:6.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

CNA: CISA-ADPCVSS-B:8.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2068441	[email protected]	Issue TrackingPermission RequiredVendor
https://www.mozilla.org/security/advisories/mfsa2026-106/	[email protected]	AdvisoryBundleVendor
https://www.mozilla.org/security/advisories/mfsa2026-107/	[email protected]	AdvisoryBundleVendor
https://www.mozilla.org/security/advisories/mfsa2026-108/	[email protected]	AdvisoryBundleVendor
https://www.mozilla.org/security/advisories/mfsa2026-109/	[email protected]
https://www.mozilla.org/security/advisories/mfsa2026-110/	[email protected]

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-119	Improper Restriction of Operations within the Bounds of a Memory Buffer	CISA-ADP

Affected Products

Product	Versions
Mozilla Firefox	All versions
CPE cpe:2.3:a:mozilla:firefox:::::::: Remediation Upgrade: 158moderate effort Upgrade: 115.43moderate effort Upgrade: 153.5moderate effort

Change History

3 change records found show changes

Date	Action	Recorded By
Oct 15, 2026	CVE Modified	CISA-ADP
Oct 13, 2026	CVE Modified	[email protected]
Oct 13, 2026	New CVE Received	[email protected]