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.

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Vendors Products
Advisories
Source ID Title
Debian DSA Debian DSA DSA-6265-1 exim4 security update
Ubuntu USN Ubuntu USN USN-8228-1 Exim vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 01 May 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 01 May 2026 05:45:00 +0000

Type Values Removed Values Added
Title Out‑of‑Bounds Write and Data Disclosure via Exim SPA Authentication Driver

Fri, 01 May 2026 02:30:00 +0000

Type Values Removed Values Added
References

Fri, 01 May 2026 02:00:00 +0000

Type Values Removed Values Added
References

Thu, 30 Apr 2026 21:45:00 +0000

Type Values Removed Values Added
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.
First Time appeared Exim
Exim exim
Weaknesses CWE-909
CPEs cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
Vendors & Products Exim
Exim exim
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-05-01T14:25:12.276Z

Reserved: 2026-04-14T00:00:00.000Z

Link: CVE-2026-40687

cve-icon Vulnrichment

Updated: 2026-05-01T14:25:08.569Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-30T22:16:25.923

Modified: 2026-05-01T19:17:51.200

Link: CVE-2026-40687

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-01T05:30:09Z

Weaknesses