CVE-2026-40687

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.

More information : https://code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505