---
title: "CVE-2026-61714: FluidSynth - Out of Bounds Read/Write"
description: "FluidSynth 2.2.4 to 2.5.6 contains an out-of-bounds read/write caused by configuring synth.midi-channels above 16 in _fluid_player_t::channel_isplaying, letting attackers cause undefined behavior affecting confidentiality, integrity, or availability, exploit requires setting midi-channels above 16."
url: https://panop.io/threat-heartbeat/CVE-2026-61714/
---

# CVE-2026-61714 FluidSynth - Out of Bounds Read/Write

FluidSynth 2.2.4 to 2.5.6 contains an out-of-bounds read/write caused by configuring synth.midi-channels above 16 in \_fluid\_player\_t::channel\_isplaying, letting attackers cause undefined behavior affecting confidentiality, integrity, or availability, exploit requires setting midi-channels above 16.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.14% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-61714)

## Details

Type

Out of Bounds Read/Write

Impact

Information Disclosure, Data Tampering, Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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-2026-61714](https://nvd.nist.gov/vuln/detail/CVE-2026-61714)
- [https://github.com/FluidSynth/fluidsynth/commit/772702e00cc6acc7c607efb40283e2269211effc](https://github.com/FluidSynth/fluidsynth/commit/772702e00cc6acc7c607efb40283e2269211effc)
- [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-976m-35rw-h3m6](https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-976m-35rw-h3m6)

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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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