CVE-2026-40687

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Summary

CVECVE-2026-40687
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-30 22:16:25 UTC
Updated2026-05-01 02:16:04 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 4.8 MEDIUM from [email protected]

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

Problem Types: CWE-909 | CWE-909 CWE-909 Missing Initialization of Resource

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
3.1CNACVSS4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Exim Exim affected 4.99.2 semver Not specified

References

ReferenceSourceLinkTags
exim.org/static/doc/security/CVE-2026-40687.txt [email protected] exim.org
code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505 [email protected] code.exim.org
www.openwall.com/lists/oss-security/2026/04/30/21 [email protected] www.openwall.com
exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.assessment [email protected] exim.org
exim.org/static/doc/security/CVE-2025-40687.txt MITRE exim.org
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