CVE-2026-45185

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.

• CWE-416

• https://code.exim.org/exim/wiki/wiki/EximSecurityVendor Advisory
• https://exim.orgProduct
• https://exim.org/static/doc/security/CVE-2026-45185.txtBroken Link
• https://exim.org/static/doc/security/EXIM-Security-2026-05-01.1/Release Notes
• https://news.ycombinator.com/item?id=48111748Issue Tracking
• https://www.openwall.com/lists/oss-security/2026/05/12/4Mailing List, Third Party Advisory
• https://xbow.com/blog/dead-letter-cve-2026-45185-xbow-found-rce-eximThird Party Advisory
• http://www.openwall.com/lists/oss-security/2026/05/12/25Mailing List, Third Party Advisory

Published

May 12, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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