Adjacent-memory read via zero sample index
Published Aug 18, 2026 · Updated Aug 18, 2026
Out-of-bounds read in libmodplug through 0.8.9.1 allows attackers to read adjacent memory via a crafted MIDI file. In pat_smplooped() in src/load_pat.cpp, the code checks only smp < MAXSMP and then reads pat_loops[smp - 1], so a zero smpno from a parsed MIDI event dereferences pat_loops[-1]. Reachability requires an application to pass attacker-supplied MIDI data into ModPlug_Load; the read is one byte before a static array, which can disclose adjacent state and alter note looping behavior but is not shown to grant code execution.
Summary
What happened
Out-of-bounds read in libmodplug through 0.8.9.1 allows attackers to read adjacent memory via a crafted MIDI file. In pat_smplooped() in src/load_pat.cpp, the code checks only smp < MAXSMP and then reads pat_loops[smp - 1], so a zero smpno from a parsed MIDI event dereferences pat_loops[-1]. Reachability requires an application to pass attacker-supplied MIDI data into ModPlug_Load; the read is one byte before a static array, which can disclose adjacent state and alter note looping behavior but is not shown to grant code execution.
The record
- CVE
- CVE-2026-75904
- Published
- Aug 18, 2026
- Updated
- Aug 18, 2026
- Vendor
- Konstanty Bialkowski
- Product
- libmodplug
- Classifications
- CWE-125, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 18, 2026CVE publishedPublication date reported by the CVE source.
- Aug 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=0.8.9.1
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- Issue 103 32-byte MIDI proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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