---
id: CVE-2026-111145
title: >-
  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
summary: >-
  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 …
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'
cwe:
  - CWE-125
vendor: Yeraze
product: ytnef
affected:
  - ytnef <= 2.1.2
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T19:17:28.873'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-111145'
references:
  - url: 'https://github.com/Yeraze/ytnef'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/Yeraze/ytnef/blob/d9f089144414d3b0912c29ab96f8f1c591d00319/lib/ytnef.c#L1554-L1563
    label: disclosure@vulncheck.com
  - url: 'https://github.com/Yeraze/ytnef/issues/112'
    label: disclosure@vulncheck.com
  - url: 'https://hackmd.io/@haind-pwn/ytnef-decompressrtf-oob-read'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/ytnef-through-2.1.2-heap-out-of-bounds-read-via-decompressrtf
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-15T19:25:46.413Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.