Buffer overflow in Sezero Libtimidity
CVE-2026-111154
libTiMidity through 0.2.8 contains a stack out-of-bounds write vulnerability in the SoundFont loader that allows attackers to corrupt stack memory via unchecked generator operators in parse_gen. Attackers can supply a crafted .sf2 file with out-of-range pgen/igen operator values to write chosen 16-bit values near the stack Layer object, causing crashes and stack memory corruption.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/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/libtimidity-soundfont-generator-oper-oob-write (technical-description, exploit)
- github.com/sezero/libtimidity/blob/a52adf6aee2635e2a16797213a089c2180e67757/src… (technical-description)
- github.com/sezero/libtimidity (product)
- www.vulncheck.com/advisories/libtimidity-through-0.2.8-stack-out-of-bounds-writ… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111154?
- CVE-2026-111154 is a medium-severity vulnerability in Sezero Libtimidity, classified under Out-of-bounds Write. CVSS score: 6.1/10. Published 2026-10-15.
- How severe is CVE-2026-111154?
- Medium severity. CVSS v3 base score is 6.1 out of 10.