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CVE-2026-103678— Tnef: heap out-of-bounds read in get_rtf_data_from_buf() via uncompressed rtf mapi value

Quick assessment

Affected
CVE-2026-103678
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。攻击者可以通过提供一个包含未压缩富文本格式（RTF）数据的特制文件来利用此漏洞。由于应用程序在 函数中复制数据前未能正确验证输入缓冲区边界，导致读取超出已分配内存范围。该缺陷可能导致应用程序崩溃，从而引发拒绝服务（DoS）攻击，或将敏感内存内容泄露到提取的输出文件中。

CVSS 5.4 · Medium EPSS 0.21% · P9

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None ≤ 1.4.18 affected

I. Basic Information for CVE-2026-103678

Vulnerability Information
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Vulnerability Title
Tnef: heap out-of-bounds read in get_rtf_data_from_buf() via uncompressed rtf mapi value
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in tnef. An attacker can exploit this vulnerability by providing a specially crafted file containing uncompressed Rich Text Format (RTF) data. Because the application fails to properly validate input buffer boundaries before copying data in get_rtf_data_from_buf(), reading beyond the allocated memory occurs. This flaw can cause the application to crash, leading to a Denial of Service (DoS), or leak sensitive memory contents into extracted output files.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

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

II. Public POCs for CVE-2026-103678

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-103678

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Vendor Advisories for CVE-2026-103678 (2)

Other References for CVE-2026-103678 (1)

IV. Related Vulnerabilities

Same weakness: CWE-125

V. Comments for CVE-2026-103678

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