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CVE-2025-4091

Published: Apr 29, 2025

Modified: Apr 13, 2026

PUBLISHED

Description

Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. 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

Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10

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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