# CVE-2025-56225: fluidsynth: fluidsynth-2.4.6 and earlier versions is vulnerable to Null pointer dereference in fluid_synth_monopoly.c, that can b...

CVE-2025-56225 is fixed in fluidsynth on 1 platform, first by DEBIAN-CVE-2025-56225, released January 9, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-56225
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0046
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 9, 2026

## Description

fluidsynth-2.4.6 and earlier versions is vulnerable to Null pointer dereference in fluid_synth_monopoly.c, that can be triggered when loading an invalid midi file.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | fluidsynth Debian 13.5 (trixie) | 2.4.4+dfsg-1+deb13u2 | [DEBIAN-CVE-2025-56225](https://patchblox.com/security/data/fix/linux/debian-cve-2025-56225.md) | Jan 9, 2026 |
| Linux | fluidsynth Debian 14 | 2.4.7+dfsg-1 | [DEBIAN-CVE-2025-56225](https://patchblox.com/security/data/fix/linux/debian-cve-2025-56225.md) | Jan 9, 2026 |
| Linux | fluidsynth opensuse-leap 16.0 | 2.3.5-160000.3.1 | [OPENSUSE-SU-2026:20291-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20291-1.md) | Feb 27, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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