CVE-2025-4087
Medium
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.
SeverityMedium
CVSS4.8
Exploit probability—
Product
Mozilla Firefox
PublishedApr 29, 2025
First seenApr 29, 2025
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- mozilla firefox128.10, 138.0 or later
- mozilla thunderbird128.10.0, 138.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 128.10, v < 138.0 | 128.10, 138.0 |
| mozilla thunderbird | v < 128.10.0, v < 138.0 | 128.10.0, 138.0 |
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