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.
References
- www.cve.org/CVERecord ↗
- nvd.nist.gov/vuln/detail/CVE-2026-40687 ↗
- code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505 ↗
- exim.org/static/doc/security/CVE-2026-40687.txt ↗
- exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.assessment ↗
- www.openwall.com/lists/oss-security/2026/04/30/21 ↗
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This product uses the NVD API but is not endorsed or certified by the NVD. CVSS scores do not establish exploitation.