CVE-2026-111271: Out-of-bounds Read in Konstanty Bialkowski libmodplug
Description
CVE-2026-111271 is a heap-based out-of-bounds read vulnerability in libmodplug version 0.8.9.1 and earlier. It occurs in the CSoundFile::ReadAMS2() function when processing crafted AMS files with pattern effect bytes that keep bit 7 set. This causes the decoder to read beyond the input buffer, potentially crashing applications using libmodplug.
CVSS v4.0
Score 6.8medium
Affected software
Konstanty Bialkowski
libmodplug
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability exists in libmodplug through version 0.8.9.1 in the CSoundFile::ReadAMS2() function located in src/load_ams.cpp. An attacker can craft an AMS module with pattern effect bytes that maintain bit 7 set, causing the decoder to read adjacent heap memory beyond the intended buffer. This out-of-bounds read can lead to application crashes in any software that consumes libmodplug for AMS file processing.
Potential Impact
Successful exploitation allows reading of adjacent heap memory, which can cause application crashes. There is no indication of code execution or information disclosure beyond the out-of-bounds read. The impact is primarily denial of service due to crashing.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid processing untrusted AMS files with libmodplug.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-15T19:33:19.766Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad14e2f2cdf04f6566084f3
Added to database: 10/15/2026, 22:05:35 UTC
Last enriched: 10/15/2026, 22:34:14 UTC
Last updated: 10/15/2026, 22:34:14 UTC
Views: 2
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