CVE-2026-103679

MEDIUM 6.5

Tnef: use-after-free and double-free in get_body_files() via multi-value body extraction

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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).

CWE	CWE-416
Published	Oct 1, 2026
Last Updated	Oct 1, 2026

Stay Ahead of the Next One

Get instant alerts for

Be the first to know when new medium vulnerabilities are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-103679 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2544477 github.com: https://github.com/verdammelt/tnef

Credits

Red Hat would like to thank Julien Ahrens (RCE Security GmbH) for reporting this issue.