Out-of-Bounds Access Vulnerability in libTiMidity Affects SoundFont Processing
CVE-2026-111156

6.9MEDIUM

Key Information:

Vendor

Sezero

Status
Libtimidity
Vendor
CVE Published:
15 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-111156?

libTiMidity versions up to 0.2.8 contain a vulnerability in the init_soundfont() function, located in src/sndfont.c, which can lead to out-of-bounds memory access. This allows attackers to exploit unvalidated SF2 preset header bank and preset values. By crafting a malicious .sf2 file with indexes that exceed the 128-entry limits of tonebank or drumset arrays, attackers can trigger unintended heap memory reads and writes, resulting in application crashes and potential memory corruption.

Affected Version(s)

libtimidity 0.2.8

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-2026-111156 - Proof of Concept

References

https://hackmd.io/@haind-pwn/libtimidity-soundfont-genera...
technical-descriptionexploit
https://github.com/sezero/libtimidity/blob/a52adf6aee2635...
technical-description
https://github.com/sezero/libtimidity
product

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
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
.