CVE-2025-68617 | THREATINT

Description

FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From versions 2.5.0 to before 2.5.2, a race condition during unloading of a DLS file can trigger a heap-based use-after-free. A concurrently running thread may be pending to unload a DLS file, leading to use of freed memory, if the synthesizer is being concurrently destroyed, or samples of the (unloaded) DLS file are concurrently used to synthesize audio. This issue has been patched in version 2.5.2. The problem will not occur, when explicitly unloading a DLS file (before synth destruction), provided that at the time of unloading, no samples of the respective file are used by active voices. The problem will not occur in versions of FluidSynth that have been compiled without native DLS support.

PUBLISHED Reserved 2025-12-19 | Published 2025-12-23 | Updated 2025-12-24 | Assigner GitHub_M

HIGH: 7.0CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem types

CWE-416: Use After Free

Product status

>= 2.5.0, < 2.5.2

affected

References

github.com/FluidSynth/fluidsynth/issues/1728 exploit

github.com/FluidSynth/fluidsynth/issues/1717 exploit

github.com/...dsynth/security/advisories/GHSA-ffw2-xvvp-39ch

github.com/FluidSynth/fluidsynth/issues/1717

github.com/FluidSynth/fluidsynth/issues/1728

github.com/...ommit/685e54cdc44911ace31774260bd0c9ec89887491

github.com/...ommit/962b9946b5cb6b16f0c08b89dd1b7016d4fce886

cve.org (CVE-2025-68617)

nvd.nist.gov (CVE-2025-68617)

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