[ CVE-2026-103680 · Published 1 Oct 2026 ]

Vulnerability in Tnef Project tnef

CVSS 6.5 EPSS <1%No fix listed yet

[ Description ]Official description

A flaw was found in tnef. A heap-based buffer overflow can occur in the find_free_number() function when generating numbered backup suffixes for duplicate filenames. When numbered backups are enabled and file overwriting is disabled, an attacker can supply a specially crafted Transport Neutral Encapsulation Format (TNEF) file with an excessive number of colliding attachment filenames, causing the numeric counter to write past the allocated memory buffer. This issue may result in an application crash, leading to a Denial of Service (DoS), or potentially arbitrary code execution.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

access.redhat.com/security/cve/CVE-2026-103680Third Party Advisory
bugzilla.redhat.com/show_bug.cgiIssue TrackingThird Party Advisory
github.com/verdammelt/tnefProduct