Heap Out-of-Bounds Read in ValleyBell libvgm PCM Data-Block Decompressor
CVE-2026-111150

6.8MEDIUM

Key Information:

Vendor

Valleybell

Status
Libvgm
Vendor
CVE Published:
15 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-111150?

The libvgm library developed by ValleyBell exhibits a heap out-of-bounds read vulnerability within its PCM data-block decompressor. An attacker can exploit this flaw by crafting a specially designed .vgm file that utilizes a type 0x7F table containing wider compressed values. This manipulation leads to an unbounded compression-table index, allowing the DecompressDataBlk function to over-read memory from the heap and potentially crash applications using the library.

Affected Version(s)

libvgm 0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-111150 - Proof of Concept

References

https://hackmd.io/@haind-pwn/libvgm-pcm-compression-table...
technical-descriptionexploit
https://github.com/ValleyBell/libvgm/blob/a6eed945ecf4e5a...
technical-description
https://github.com/ValleyBell/libvgm/blob/a6eed945ecf4e5a...
technical-description

CVSS V4

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

HaiND from the Post and Telecommunication Institute of Technology
.