---
title: "CVE-2026-58264: FluidSynth - Buffer Overflow"
description: "FluidSynth 1.1.2 to 2.5.6 contains a buffer overflow caused by lack of bounds checking on the pitch_bend_range command channel argument in the command handler, letting remote or local attackers cause denial of service or execute code, exploit requires use of TCP server or command shell."
url: https://panop.io/threat-heartbeat/CVE-2026-58264/
---

# CVE-2026-58264 FluidSynth - Buffer Overflow

FluidSynth 1.1.2 to 2.5.6 contains a buffer overflow caused by lack of bounds checking on the pitch\_bend\_range command channel argument in the command handler, letting remote or local attackers cause denial of service or execute code, exploit requires use of TCP server or command shell.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.59% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-58264)

## Details

Type

Buffer Overflow

Impact

Denial Of Service, Remote Code Execution

CVSS vector

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

Published

18 September 2026

Updated

15 October 2026

Weakness

[CWE-122](https://cwe.mitre.org/data/definitions/122.html)

## Vendor fix

Update to version 2.5.6 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-58264](https://nvd.nist.gov/vuln/detail/CVE-2026-58264)
- [https://github.com/FluidSynth/fluidsynth/commit/762a3bd39a431cd45abf3bbcce7286c87909d087](https://github.com/FluidSynth/fluidsynth/commit/762a3bd39a431cd45abf3bbcce7286c87909d087)
- [https://github.com/FluidSynth/fluidsynth/pull/1796](https://github.com/FluidSynth/fluidsynth/pull/1796)
- [https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6](https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6)
- [https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-mqmq-w63q-cj94](https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-mqmq-w63q-cj94)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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