CVEvulnerability
CVE-2026-40687
9.1 CRITICAL
Official page ↗
- Status
- Analyzed
- Published
- 2026-04-30
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 4.8 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
- CVSS 3.1 ([email protected])
- 9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Weaknesses
- CWE-909
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.
Affected configurations
• exim exim (< 4.99.2)
Related
Weakness · CWE (1)
- CWE-909 Missing Initialization of Resource weakness
References
- https://code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505 Patch
- https://exim.org/static/doc/security/CVE-2026-40687.txt Broken Link
- https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.assessment Vendor Advisory
- https://www.openwall.com/lists/oss-security/2026/04/30/21 Mailing List, Third Party Advisory