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

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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.