Bug 2553720 (CVE-2026-111123)

Summary: CVE-2026-111123 fluidsynth: fluidsynth: Denial of Service via crafted SoundFont file
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FluidSynth. An attacker could exploit this vulnerability by tricking a user or application into loading and playing a specially crafted SoundFont (SF2) audio file containing invalid modulator destination values. This flaw triggers an out-of-bounds write, resulting in memory corruption and a Denial of Service (DoS) through an application crash.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2554038, 2554039, 2554040    
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Description OSIDB Bzimport 2026-10-15 19:21:05 UTC
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.