CVE-2026-40687
CVSS Score
4.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-909 |
| Vendor | exim |
| Product | exim |
| Published | Apr 30, 2026 |
| Last Updated | Apr 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low
Affected Versions
Exim / Exim
0 < 4.99.2
References
exim.org: https://exim.org/static/doc/security/CVE-2025-40687.txt openwall.com: https://www.openwall.com/lists/oss-security/2026/04/30/21 exim.org: https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.assessment code.exim.org: https://code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505