Description
Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsing path. It is triggered when a client sends a TLS close_notify mid-body during a CHUNKING transfer, followed by a final cleartext byte on the same TCP connection. This can lead to heap corruption. An unauthenticated network attacker exploiting this vulnerability could execute arbitrary code.
References
- www.cve.org/CVERecord ↗
- nvd.nist.gov/vuln/detail/CVE-2026-45185 ↗
- code.exim.org/exim/wiki/wiki/EximSecurity ↗
- exim.org/ ↗
- exim.org/static/doc/security/CVE-2026-45185.txt ↗
- exim.org/static/doc/security/EXIM-Security-2026-05-01.1/ ↗
- news.ycombinator.com/item ↗
- www.openwall.com/lists/oss-security/2026/05/12/4 ↗
- xbow.com/blog/dead-letter-cve-2026-45185-xbow-found-rce-exim ↗
- www.openwall.com/lists/oss-security/2026/05/12/25 ↗
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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.