CVE-2026-111123 Details
Description
FluidSynth through 2.6.1 contains an out-of-bounds write vulnerability that allows attackers to corrupt heap and stack memory by supplying unvalidated SoundFont modulator destination values. Attackers can craft an SF2 file with PMOD/IMOD destinations of 63 to 255 that, when loaded and played, write past the voice generator array and updated_gen_bit, causing memory corruption and crashes.
A vulnerability allowing out-of-bounds write operations has been identified in FluidSynth versions through 2.6.1. This issue arises from the synthesis engine's failure to validate modulator destination values in SoundFont files. Attackers can exploit this by crafting an SF2 file that includes unverified PMOD or IMOD destination values ranging from 63 to 255. When such a file is loaded and played, the invalid values overwrite memory beyond the allocated voice generator array, leading to heap and stack corruption, and causing the application to crash.
Users can upgrade to FluidSynth version 2.6.2 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 15, 2026CISA-ADP
Assessed Oct 15, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-787 | Out-of-bounds Write | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| FluidSynth | <= 2.6.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 15, 2026 | CVE Modified | CISA-ADP |
| Oct 15, 2026 | New CVE Received | [email protected] |