Out-of-bounds Read in Valleybell Libvgm
CVE-2026-111150
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.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind-pwn/libvgm-pcm-compression-table-oob-read (technical-description, exploit)
- github.com/ValleyBell/libvgm/blob/a6eed945ecf4e5a25cf82004779c6f7e4fd5c319/play… (technical-description)
- github.com/ValleyBell/libvgm/blob/a6eed945ecf4e5a25cf82004779c6f7e4fd5c319/play… (technical-description)
- github.com/ValleyBell/libvgm (product)
- www.vulncheck.com/advisories/valleybell-libvgm-through-commit-a6eed945-heap-out… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111150?
- CVE-2026-111150 is a medium-severity vulnerability in Valleybell Libvgm, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2026-10-15.
- How severe is CVE-2026-111150?
- Medium severity. CVSS v3 base score is 5.5 out of 10.