CVE-2026-40687

Critical

Open

TLP:CLEAR

NVD CVE.org

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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.

Details

CVSS Score: 9.1
EPSS Score ⓘ: 0.37%

30.5th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Confidence: 90%
Published: Apr 30, 2026

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