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CVE-2025-4087

Published: Apr 29, 2025

Modified: Apr 13, 2026

PUBLISHED

Description

A vulnerability was identified in Thunderbird where XPath parsing could trigger undefined behavior due to missing null checks during attribute access. This could lead to out-of-bounds read access and potentially, memory corruption. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Thunderbird 138, and Thunderbird 128.10.

Vendor	Product	Versions
Mozilla	Firefox	unaffected `128.10 - <= 128.` unaffected `138 - <= `
Mozilla	Thunderbird	unaffected `128.10 - <= 128.` unaffected `138 - <= `

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1952465

https://www.mozilla.org/security/advisories/mfsa2025-28/

https://www.mozilla.org/security/advisories/mfsa2025-29/

https://www.mozilla.org/security/advisories/mfsa2025-31/

https://www.mozilla.org/security/advisories/mfsa2025-32/

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