Memory safety bugs present in Firefox 138 and Thunderbird 138. 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 139 and Thunderbird 139.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Freebsd | — | Upgrade thunderbirdUpgrade firefox | May 31, 2025 | May 30, 2025 |
| Mfsa2025 42 | — | Upgrade to Mozilla Firefox version 139.0Upgrade to the latest version of Mozilla Firefox | May 28, 2025 | May 27, 2025 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 139.0Upgrade to the latest version of Mozilla Thunderbird | May 28, 2025 | May 27, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 27, 2025 |
| Ubuntu | — | Upgrade thunderbird | Jun 26, 2025 | May 27, 2025 |
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