What’s Vulnerable › Vulnerabilities

CVE-2026-111271: libmodplug through 0.8.9.1 Heap Out-of-Bounds Read via CSoundFile::ReadAMS2

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-16
• Weakness: CWE-125

Description

libmodplug through 0.8.9.1 contains a heap-based out-of-bounds read vulnerability in CSoundFile::ReadAMS2() in src/load_ams.cpp that allows attackers to read adjacent heap memory via crafted AMS files. Attackers can supply an AMS module whose pattern effect bytes keep bit 7 set, driving the decoder past the input buffer and crashing any libmodplug consumer.

Affected products

• Konstanty Bialkowski libmodplug: through 0.8.9.1

References

• https://github.com/Konstanty/libmodplug
• https://github.com/Konstanty/libmodplug/blob/d1b97ed0020bc620a059d3675d1854b40bd2608d/src/load_ams.cpp#L509-L537
• https://hackmd.io/@haind-pwn/libmodplug-dsm-pattern-oob-write
• https://www.vulncheck.com/advisories/libmodplug-through-0.8.9.1-heap-out-of-bounds-read-via-csoundfile-readams2
• https://hackmd.io/@haind-pwn/libmodplug-dsm-pattern-oob-write

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