CVE-2026-103680

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.

• CWE-787

• https://access.redhat.com/security/cve/CVE-2026-103680
• https://bugzilla.redhat.com/show_bug.cgi?id=2544478
• https://github.com/verdammelt/tnef

Published

Oct 1, 2026

Last Modified

Oct 1, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-103656Rejected reason: this is rejected
• CVE-2026-103659MISP contains an authorization bypass in the event flattenin…7.1
• CVE-2026-103662MISP contains a reflected cross-site scripting (XSS) vulnera…5.1
• CVE-2026-103664MISP contains a reflected cross-site scripting (XSS) vulnera…4.8
• CVE-2026-103678A flaw was found in tnef. An attacker can exploit this vulne…5.4
• CVE-2026-103679A flaw was found in tnef. A remote attacker could exploit th…6.5
• CVE-2026-103686A flaw has been found in rhukster dom-sanitizer up to 1.0.15…3.5
• CVE-2026-103687A vulnerability has been found in rhukster dom-sanitizer up …7.3
• CVE-2026-103690A flaw has been found in itsourcecode Leave Management Syste…6.3
• CVE-2026-1037IBM Common Licensing Agent 9.0, Agent 9.0.0.1, Agent 9.0.0.2…6.1
• CVE-2026-103752Unauthenticated Privilege Escalation in Authorizer <= 3.15.3…9.8
• CVE-2026-103754A flaw was found in ansible-runner. The unstream_dir() funct…5.9