What’s Vulnerable › Vulnerabilities

CVE-2026-111270: libmodplug through 0.8.9.1 Heap Out-of-Bounds Write via CSoundFile::ReadDSM

• Severity: medium (CVSS 6.1 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 2026-10-21
• Weakness: CWE-787

Description

libmodplug through 0.8.9.1 contains a heap-based out-of-bounds write in CSoundFile::ReadDSM() in src/load_dsm.cpp because nPat is never checked against MAX_PATTERNS. Attackers can supply a crafted DSM file with over 240 PATT chunks or a wrapping patt_len value to corrupt heap memory and crash the consuming process.

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_dsm.cpp#L130-L139
• 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-write-via-csoundfile-readdsm
• https://hackmd.io/@haind-pwn/cve-2026-111270-111271-libmodplug-dsm-pattern-oob-write

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