Medium severity4.8NVD Advisory· Published Apr 30, 2026· Updated Jun 17, 2026
CVE-2026-40687
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
22- osv-coords20 versionspkg:apk/wolfi/exim-mysqlpkg:apk/wolfi/exim-cdbpkg:apk/wolfi/exim-dnsdbpkg:apk/chainguard/exim-cdbpkg:apk/chainguard/exim-dnsdbpkg:apk/chainguard/exim-mysqlpkg:apk/chainguard/exim-pgsqlpkg:apk/chainguard/exim-scriptspkg:apk/chainguard/exim-sqlitepkg:apk/chainguard/exim-utilspkg:apk/wolfi/exim-dbmdbpkg:apk/wolfi/exim-docpkg:apk/wolfi/exim-scriptspkg:apk/wolfi/exim-sqlitepkg:apk/wolfi/exim-utilspkg:apk/chainguard/exim-docpkg:apk/wolfi/exim-pgsqlpkg:apk/chainguard/eximpkg:apk/chainguard/exim-dbmdbpkg:apk/wolfi/exim
< 4.99.5-r0+ 19 more
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
- (no CPE)range: < 4.99.5-r0
Patches
Vulnerability mechanics
References
4- 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
1- ⚡ Weekly Recap: AI-Powered Phishing, Android Spying Tool, Linux Exploit, GitHub RCE & MoreThe Hacker News · May 4, 2026