Memory Management Flaw in TNEF Files Affects Multiple Products by Red Hat
CVE-2026-103679

6.5MEDIUM

Key Information:

Status
Vendor
CVE Published:
1 October 2026

What is CVE-2026-103679?

A flaw has been identified in the Transport Neutral Encapsulation Format (TNEF), where a remote attacker can exploit this vulnerability by crafting a specially designed TNEF file that includes multiple message bodies. This situation leads to improper memory management during the extraction process, resulting in a use-after-free and double-free condition. Consequently, this flaw can cause the associated application to crash, leading to a Denial of Service (DoS), hindering normal operations and affecting system availability.

References

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

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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