CVEvulnerability
CVE-2025-68617
7.0 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2025-12-23
- Last modified
- 2026-10-19
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.0 HIGH — CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- CVSS 3.1 ([email protected])
- 7.0 HIGH — CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-416
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.
Affected configurations
• fluidsynth fluidsynth (>= 2.5.0 < 2.5.2)
Related
Weakness · CWE (1)
- CWE-416 Use After Free weakness
References
- https://github.com/FluidSynth/fluidsynth/commit/685e54cdc44911ace31774260bd0c9ec89887491 Patch
- https://github.com/FluidSynth/fluidsynth/commit/962b9946b5cb6b16f0c08b89dd1b7016d4fce886 Patch
- https://github.com/FluidSynth/fluidsynth/issues/1717 Exploit, Issue Tracking
- https://github.com/FluidSynth/fluidsynth/issues/1728 Issue Tracking
- https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-ffw2-xvvp-39ch Vendor Advisory
- https://github.com/FluidSynth/fluidsynth/issues/1717 Exploit, Issue Tracking
- https://github.com/FluidSynth/fluidsynth/issues/1728 Issue Tracking