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CVE-2026-40687

MEDIUM

4.8

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.

CVE Details

CVSS v3.1 Score4.8

SeverityMEDIUM

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

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published4/30/2026

Last Modified5/1/2026

Sourcenvd

Honeypot Sightings0

Affected Products

exim:exim

Weaknesses (CWE)

CWE-909

References

https://code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505(cve@mitre.org)

https://exim.org/static/doc/security/CVE-2026-40687.txt(cve@mitre.org)

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

https://www.openwall.com/lists/oss-security/2026/04/30/21(cve@mitre.org)

IOC Correlations

No correlations recorded

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