CVE-2026-40687
Medium
Description
In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory.
SeverityMedium
CVSS4.8
Exploit probability—
Product
Exim
PublishedApr 30, 2026
First seenApr 30, 2026
Weakness typeCWE-909CWE-909
How to fix
Update
- exim exim4.99.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| exim exim | v < 4.99.2 | 4.99.2 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.