CVE-2026-40687

Published: Apr 30, 2026Modified: Jun 17, 2026

9.1

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Exploitability: 3.9 / Impact: 5.2

Source: NVD

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.

Affected (1)

Products: Exim: Exim

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Exim Exim	Before 4.99.2

Related CWEs

Missing Initialization of Resource

The product does not initialize a critical resource.

References (4)

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

Source: cve@mitre.org

Patch

https://exim.org/static/doc/security/CVE-2026-40687.txt

Source: cve@mitre.org

Broken Link

https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.assessment

Source: cve@mitre.org

Vendor Advisory

https://www.openwall.com/lists/oss-security/2026/04/30/21

Source: cve@mitre.org

Mailing ListThird Party Advisory

Timeline

No history available yet.