Medium severity4.8NVD Advisory· Published Apr 30, 2026· Updated May 1, 2026

CVE-2026-40687

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Exim/Exim2 versions
cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*range: <4.99.2
- (no CPE)range: <4.99.2

Patches

Vulnerability mechanics

References

code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505nvdPatch
exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.assessmentnvdVendor Advisory
www.openwall.com/lists/oss-security/2026/04/30/21nvdMailing ListThird Party Advisory
exim.org/static/doc/security/CVE-2026-40687.txtnvdBroken Link

News mentions

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The Hacker News · May 4, 2026

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