CVE-2026-103679: Tnef Project Tnef

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw was found in tnef. A remote attacker could exploit this vulnerability by providing a specially crafted Transport Neutral Encapsulation Format (TNEF) file containing multiple message bodies. During extraction, improper memory management triggers a use-after-free and double-free condition, causing the application to crash and resulting in a Denial of Service (DoS).

Affected products

• Tnef Project Tnef: up to and including 1.4.18

Published 2026-10-01. Last modified 2026-10-05.