CVSS 4.8 · MEDIUM
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.
View on NVDSeverity
Score: 4.8(MEDIUM)
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:LAV: NETWORK
AC: HIGH
PR: NONE
UI: NONE
S: UNCHANGED
C: LOW
I: NONE
A: LOW
Weakness (CWE):
CWE-909EPSS
Probability of exploitation (next 30 days): 0.0008 (0.1%)
Percentile: 22.7%
EPSS: 2026-05-06
Affects
exim:eximTechnical 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.
Published: 4/30/2026, 10:16:25 PM
Last modified: 5/1/2026, 7:17:51 PM