Vulnerability · Published Oct 15, 2026 · Assigned by VulnCheck
CVE-2026-111150ValleyBell libvgm through commit a6eed945 Heap Out-of-Bounds Read via DecompressDataBlk
Medium 5.5
In plain English
A medium-severity out-of-bounds read in libvgm from ValleyBell. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.1%top 97.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
ValleyBell libvgm through commit a6eed945 contains a heap out-of-bounds read vulnerability in the PCM data-block decompressor caused by an unbounded compression-table index. Attackers can supply a crafted .vgm file with a small type 0x7F table and wider compressed values, causing DecompressDataBlk to over-read heap memory and crash consumers.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ValleyBell | libvgm | 0 – through a6eed945ecf4e5a25cf82004779c6f7e4fd5c319 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- https://hackmd.io/@haind-pwn/libvgm-pcm-compression-table-oob-read technical-description, exploit
- https://github.com/ValleyBell/libvgm/blob/a6eed945ecf4e5a25cf82004779c6f7e4fd5c319/player/dblk_compr.c#L727-L751 technical-description
- https://github.com/ValleyBell/libvgm/blob/a6eed945ecf4e5a25cf82004779c6f7e4fd5c319/player/dblk_compr.c#L183-L190 technical-description
- https://github.com/ValleyBell/libvgm product
- VulnCheck Advisory: ValleyBell libvgm through commit a6eed945 Heap Out-of-Bounds Read via DecompressDataBlk third-party-advisory