CVE-2026-61723: medium-severity vulnerability in fluidsynth
FluidSynth: DLS ptbl Chunk Integer Overflow
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.8epss 0.2%
FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.5.0 until 2.5.6, the native DLS parser validates ptbl chunks with the unsigned expression cues * 4 + cbsize without checking whether the multiplication and addition fit in 32 bits. A crafted DLS file can supply a large cues value that wraps the expression and passes the chunk-size check, causing poolcues.resize(cues) to request approximately four gigabytes and the parser to read billions of entries beyond the chunk boundary. The excessive allocation and invalid reads can cause denial of service. Builds with enable-native-dls set to OFF are not exposed. This issue is fixed in version 2.5.6.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Affected products
FluidSynth · fluidsynthRelated CVEs — fluidsynth
In the same product, most dangerous first.
CVE-2021-21417HIGHUse after free in fluidsynthEPSS 0.9%CVE-2026-58264CRITICALFluidSynth: Heap-based buffer overrunEPSS 0.6%CVE-2025-68617HIGHUse after free in fluidsynthEPSS 0.2%CVE-2026-61722MEDIUMFluidSynth: DLS Articulation Chunk Integer OverflowEPSS 0.2%CVE-2026-111123MEDIUMFluidSynth through 2.6.1 Out-of-Bounds Write via SoundFont Modulator DestinationEPSS 0.2%CVE-2026-61721HIGHFluidSynth: Heap-based buffer overrun for DLS samplesEPSS 0.2%