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CVE-2026-61714— FluidSynth: Heap Buffer Overflow in MIDI Player

Quick assessment

Affected
FluidSynth fluidsynth
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FluidSynth 是一款基于 SoundFont 2 规范实现的软件合成器。在 2.2.4 至 2.5.6 版本中，若将配置项 设置为大于 16，MIDI 播放器在追踪活动通道时，会导致对 的索引超出其固定大小堆分配的范围。由此引发的越界读取和写入会触发未定义行为，可能影响数据的机密性、完整性或可用性。由于该不安全状态由通道数配置本身引起，因此无需特制的 MIDI 文件即可触发。将 保持默认值 16 可避免进入存在漏洞的代码路径。该问题已在 2.5.6 版本中修复。

CVSS 7.8 · High

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-61714

Vulnerability Information
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Vulnerability Title
FluidSynth: Heap Buffer Overflow in MIDI Player
Source: CVE Program / CVE List V5
Vulnerability Description
FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.2.4 until 2.5.6, configuring synth.midi-channels above 16 allows the MIDI player to index _fluid_player_t::channel_isplaying outside its fixed-size heap allocation while tracking active channels. The resulting out-of-bounds reads and writes invoke undefined behavior and may compromise confidentiality, integrity, or availability. No crafted MIDI file is required because the unsafe condition is created by the channel-count configuration itself. Keeping synth.midi-channels at its default value of 16 avoids the vulnerable path. This issue is fixed in version 2.5.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FluidSynth fluidsynth >= 2.2.4, < 2.5.6 -

II. Public POCs for CVE-2026-61714

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III. Intelligence Information for CVE-2026-61714

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Patches & Fixes for CVE-2026-61714 (1)

Other References for CVE-2026-61714 (2)

Same Patch Batch · FluidSynth · 2026-09-18 · 6 CVEs total

CVE-2026-58264 9.8 CRITICAL FluidSynth: Heap-based buffer overrun
CVE-2026-61721 8.0 HIGH FluidSynth: Heap-based buffer overrun for DLS samples
CVE-2026-61723 6.8 MEDIUM FluidSynth: DLS ptbl Chunk Integer Overflow
CVE-2026-61722 6.8 MEDIUM FluidSynth: DLS Articulation Chunk Integer Overflow
CVE-2026-61720 6.2 MEDIUM FluidSynth: SF2 DMOD Chunk Unsigned Underflow

IV. Related Vulnerabilities

Same product: fluidsynth
Same vendor: FluidSynth
Same weakness: CWE-122

V. Comments for CVE-2026-61714

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