Medium severity · published Oct 1, 2026
CVE-2026-103679
Tnef: use-after-free and double-free in get_body_files() via multi-value body extraction
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
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).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TN
Tnef · Tnef Project
through 1.4.18 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103679
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103679
vdb-entry
https://access.redhat.com/security/cve/CVE-2026-103679
issue-tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2544477
github.com
https://github.com/verdammelt/tnef
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