WildMIDI through 0.5.0 Heap Out-of-Bounds Read via _WM_ParseNewHmp

Advisories

WildMIDI through 0.5.0 Heap Out-of-Bounds Read via _WM_ParseNewHmp

Severity: medium
Date: 10/15/2026
Affecting: WildMIDI <= 0.5.0
CVE: CVE-2026-111162
CWE: CWE-125 Out-of-bounds Read
CVSS: 6.9
CVSS V4 Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
References: https://hackmd.io/@haind-pwn/wildmidi-hmp-chunk-length-underflow-oob-read
https://github.com/Mindwerks/wildmidi/blob/340472ed4633d139d30c660b90eca03c1320e593/src/f_hmp.c#L258-L261
https://github.com/Mindwerks/wildmidi/blob/340472ed4633d139d30c660b90eca03c1320e593/src/internal_midi.c#L2166-L2172
https://github.com/Mindwerks/wildmidi
Credit: HaiND from the Post and Telecommunication Institute of Technology
Description: WildMIDI through 0.5.0 contains a heap out-of-bounds read vulnerability in the HMP parser _WM_ParseNewHmp() that allows attackers to read beyond buffers via underflowed chunk lengths. Attackers can supply a crafted .hmp file with a chunk length of 0-12 that wraps to roughly 4 GB, crashing applications or exposing heap bytes through WildMidi_GetInfo().

Ready to get Started?

Explore VulnCheck, a next-generation Cyber Threat Intelligence platform, which provides exploit and vulnerability intelligence to help you prioritize and remediate vulnerabilities that matter.

Vulnerability Prioritization
Prioritize vulnerabilities that matter based on the threat landscape and defer vulnerabilities that don't.
Early Warning System
Real-time alerting of changes in the vulnerability landscape so that you can take action before the attacks start.

Schedule a Demo