CVE-2025-68617
7.0 · HIGHOverview
CVE-2025-68617 is a high-severity vulnerability affecting fluidsynth fluidsynth. It was published on December 23, 2025 and has a CVSS 3.1 base score of 7.0 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from fluidsynth. Update fluidsynth to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| fluidsynth | fluidsynth | >= 2.5.0, < 2.5.2 | Affected |
References
Frequently Asked Questions
What is CVE-2025-68617?
CVE-2025-68617 is a high-severity vulnerability affecting fluidsynth fluidsynth. It was published on December 23, 2025 and has a CVSS 3.1 base score of 7.0 (HIGH).
How severe is CVE-2025-68617?
This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-68617?
Check the references section for vendor advisories and patches from fluidsynth. Update fluidsynth to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-68617?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-68617 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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