Description
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected products
- Mozilla / Firefox115.34 – 115.*
- Mozilla / Firefox140.9 – 140.*
- Mozilla / Firefox149 – *
- Mozilla / Thunderbird140.9 – 140.*
- Mozilla / Thunderbird149 – *
References
- MISChttps://bugzilla.mozilla.org/show_bug.cgi?id=2016374
- VENDOR_ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2026-20/
- VENDOR_ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2026-21/
- VENDOR_ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2026-22/
- VENDOR_ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2026-23/
- VENDOR_ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2026-24/