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CVE-2026-103680— Tnef: heap buffer overflow in find_free_number() via numbered-backup suffix generation

Quick assessment

Affected
CVE-2026-103680
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 tnef 中发现了一个漏洞。当为重复的文件名生成带编号的备份后缀时， 函数中可能发生堆缓冲区溢出。如果启用了带编号的备份功能且禁用了文件覆盖，攻击者可以提供一个经过特殊构造的传输中性封装格式（TNEF）文件，其中包含大量冲突的附件文件名，从而导致数字计数器写入超出已分配内存缓冲区的范围。该问题可能导致应用程序崩溃，进而引发拒绝服务（DoS）攻击，甚至可能允许执行任意代码。

CVSS 3.1 · Low

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

I. Basic Information for CVE-2026-103680

Vulnerability Information
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Vulnerability Title
Tnef: heap buffer overflow in find_free_number() via numbered-backup suffix generation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 1.4.18 -

II. Public POCs for CVE-2026-103680

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-103680

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Vendor Advisories for CVE-2026-103680 (2)

Other References for CVE-2026-103680 (1)

IV. Related Vulnerabilities

Same weakness: CWE-787

V. Comments for CVE-2026-103680

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