CVE-2026-103678: Tnef Project Tnef

High severity, CVSS 8.1. EPSS: 0.2% chance of exploitation in the next 30 days.

A flaw was found in tnef. An attacker can exploit this vulnerability by providing a specially crafted file containing uncompressed Rich Text Format (RTF) data. Because the application fails to properly validate input buffer boundaries before copying data in get_rtf_data_from_buf(), reading beyond the allocated memory occurs. This flaw can cause the application to crash, leading to a Denial of Service (DoS), or leak sensitive memory contents into extracted output files.

Affected products

• Tnef Project Tnef: up to and including 1.4.18

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