Vulnerability DatabaseCVE-2026-40687
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CVE-2026-40687
Published:April 30, 2026
Updated:May 18, 2026
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 Packages
https://github.com/Exim/exim.git (GITHUB):
Affected version(s) >=exim-4_50 <exim-4.99.2
Fix Suggestion:
Update to version exim-4.99.2
Related Resources (5)
https://exim.org/static/doc/security/CVE-2025-40687.txt
https://www.openwall.com/lists/oss-security/2026/04/30/21
https://code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505
https://exim.org/static/doc/security/CVE-2026-40687.txt
https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.assessment
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CVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.8
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Missing Initialization of Resource
CWE-909
EPSS
Base Score:
0.11