CVE-2026-40687CWE-909

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…

Medium · published April 30, 2026

CVSS v3.1
4.8
EPSS
0%
Percentile
30.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00373 · 30.4th percentile
Weakness
CWE-909 · Missing Initialization of Resource
Published
2026-04-30T00:00Z
EPSS history
Timeline
  • 30 APR 00:00Z
    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…
    cvelistv5