CVE-2026-45185

Descripción

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.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

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