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CVE-2026-109776 Details

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

Race condition in the XPCOM component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:4.2 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

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URL	Source(s)	Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2069395	[email protected]	Issue TrackingPermission RequiredVendor
https://www.mozilla.org/security/advisories/mfsa2026-106/	[email protected]	AdvisoryBundleVendor
https://www.mozilla.org/security/advisories/mfsa2026-108/	[email protected]	AdvisoryBundleVendor
https://www.mozilla.org/security/advisories/mfsa2026-109/	[email protected]	AdvisoryBundleVendor
https://www.mozilla.org/security/advisories/mfsa2026-110/	[email protected]	AdvisoryBundleVendor

CWE-ID	CWE Name	Source
CWE-362	Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')	CISA-ADP

Product	Versions
Mozilla Firefox	All versions
CPE cpe:2.3:a:mozilla:firefox:::::::: Remediation Upgrade: 158moderate efforthttps://www.firefox.com/firefox/158.0/releasenotes/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=footer&utm_content=company
Mozilla Firefox ESR	All versions
CPE cpe:2.3:a:mozilla:firefox_esr:::::::: Remediation Upgrade: 153.5moderate efforthttps://www.firefox.com/firefox/158.0/releasenotes/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=footer&utm_content=company
Mozilla Thunderbird	All versions
CPE cpe:2.3:a:mozilla:thunderbird:::::::: Remediation Upgrade: 158moderate efforthttps://www.firefox.com/firefox/158.0/releasenotes/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=footer&utm_content=company Upgrade: 153.5moderate efforthttps://www.firefox.com/firefox/158.0/releasenotes/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=footer&utm_content=company

3 change records found show changes

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