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CVE-2026-111145— ytnef through 2.1.2 Heap Out-of-Bounds Read via DecompressRTF

Quick assessment

Affected
Yeraze ytnef
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.

ytnef 在 2.1.2 及更早版本中存在一个堆越界读取漏洞，位于 lib/ytnef.c 文件中的 DecompressRTF() 函数。该漏洞源于程序未对未压缩 RTF 流的 uncompressedSize 进行有效性校验。攻击者可以构造一个包含恶意 PT_BINARY MAPI 属性的 winmail.dat TNEF 附件，从而导致 ytnefprint 程序或被 libytnef 库调用的应用程序发生崩溃，并可能泄露相邻的堆内存数据。

CVSS 6.1 · Medium EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
Yeraze ytnef ≤ 2.1.2 affected
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I. Basic Information for CVE-2026-111145

Vulnerability Information
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Vulnerability Title
ytnef through 2.1.2 Heap Out-of-Bounds Read via DecompressRTF
Source: CVE Program / CVE List V5
Vulnerability Description
ytnef through 2.1.2 contains a heap out-of-bounds read vulnerability in DecompressRTF() in lib/ytnef.c that never validates uncompressedSize for uncompressed RTF streams. Attackers can supply a crafted winmail.dat TNEF attachment with a malicious PT_BINARY MAPI property to crash ytnefprint or libytnef callers and leak adjacent heap memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
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
Yeraze ytnef 0 ~ 2.1.2 -

II. Public POCs for CVE-2026-111145

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III. Intelligence Information for CVE-2026-111145

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Vendor Advisories for CVE-2026-111145 (1)

Proof of Concept for CVE-2026-111145 (1)

Other References for CVE-2026-111145 (1)

IV. Related Vulnerabilities

Same product: ytnef
Same vendor: Yeraze
Same weakness: CWE-125

V. Comments for CVE-2026-111145

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