CVE catalog
CVE-2026-61714
FluidSynth vulnerabilities
- Severity
- Critical · CVSS 9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.14% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | fluidsynth | sid | 2.6.1+dfsg-2 | fixed |
| Debian | fluidsynth | forky | 2.6.1+dfsg-2 | fixed |
| Debian | fluidsynth | trixie | 2.4.4+dfsg-1+deb13u3 | fixed |
| Debian | fluidsynth | bookworm | 2.3.1-2 | vulnerable |
| Ubuntu | fluidsynth | noble | 2.3.4-1ubuntu0.1~esm1 | fixed |
| Ubuntu | libfluidsynth-dev | noble | 2.3.4-1ubuntu0.1~esm1 | fixed |
| Ubuntu | libfluidsynth3 | noble | 2.3.4-1ubuntu0.1~esm1 | fixed |
| Ubuntu | fluidsynth | pro | 2.4.7+dfsg-2 | vulnerable |
| Ubuntu | fluidsynth | pro | 2.4.8+dfsg-1 | vulnerable |
| Ubuntu | fluidsynth | pro | 2.4.8+dfsg-1ubuntu0.1~esm1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | fluidsynth | source | sid | 2.5.6+dfsg-1 | not yet assigned | Not reported | Not reported |
| Debian | fluidsynth | source | forky | 2.5.6+dfsg-1 | not yet assigned | Not reported | Not reported |
| Debian | fluidsynth | source | trixie | 2.4.4+dfsg-1+deb13u3 | not yet assigned | Not reported | Not reported |
| Debian | fluidsynth | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Ubuntu | fluidsynth | deb | noble | 2.3.4-1ubuntu0.1~esm1 | Not reported | Not reported | Not reported |
| Ubuntu | libfluidsynth-dev | deb | noble | 2.3.4-1ubuntu0.1~esm1 | Not reported | Not reported | Not reported |
| Ubuntu | libfluidsynth3 | deb | noble | 2.3.4-1ubuntu0.1~esm1 | Not reported | Not reported | Not reported |
| Ubuntu | fluidsynth | deb | pro | 2.4.8+dfsg-1ubuntu0.1~esm1 | Not reported | UBUNTU-CVE-2026-61714 | Not reported |
Notes
[bookworm] fluidsynth: Needs a non-default synth.midi-channels > 16; MIDI file channels are masked to 4 bits so a crafted file cannot reach it
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [fluidsynth]Affected
Details (2)
2.3.1-2· amd64 · bookwormAffected
usn · fluidsynth · debian · bookworm; usn · fluidsynth · debian · 12
2.3.1-2· arm64 · bookwormAffected
usn · fluidsynth · debian · bookworm; usn · fluidsynth · debian · 12
- [libfluidsynth3]Affected
Source package: [fluidsynth]
Details (2)
2.3.1-2· amd64 · bookwormAffected
usn · fluidsynth · debian · bookworm; usn · fluidsynth · debian · 12
2.3.1-2· arm64 · bookwormAffected
usn · fluidsynth · debian · bookworm; usn · fluidsynth · debian · 12
- [libfluidsynth-dev]Affected
Source package: [fluidsynth]
Details (2)
2.3.1-2· amd64 · bookwormAffected
usn · fluidsynth · debian · bookworm; usn · fluidsynth · debian · 12
2.3.1-2· arm64 · bookwormAffected
usn · fluidsynth · debian · bookworm; usn · fluidsynth · debian · 12
[Debian 13 (Trixie)]
- [fluidsynth]Affected
Details (2)
2.4.4+dfsg-1+deb13u2· amd64 · trixieAffected · Fixed:
2.4.4+dfsg-1+deb13u3usn · fluidsynth · debian · 13
2.4.4+dfsg-1+deb13u2· arm64 · trixieAffected · Fixed:
2.4.4+dfsg-1+deb13u3usn · fluidsynth · debian · 13
- [libfluidsynth3]Affected
Source package: [fluidsynth]
Details (2)
2.4.4+dfsg-1+deb13u2· amd64 · trixieAffected · Fixed:
2.4.4+dfsg-1+deb13u3usn · fluidsynth · debian · 13
2.4.4+dfsg-1+deb13u2· arm64 · trixieAffected · Fixed:
2.4.4+dfsg-1+deb13u3usn · fluidsynth · debian · 13
- [libfluidsynth-dev]Affected
Source package: [fluidsynth]
Details (2)
2.4.4+dfsg-1+deb13u2· amd64 · trixieAffected · Fixed:
2.4.4+dfsg-1+deb13u3usn · fluidsynth · debian · 13
2.4.4+dfsg-1+deb13u2· arm64 · trixieAffected · Fixed:
2.4.4+dfsg-1+deb13u3usn · fluidsynth · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-61714]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-61714]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-61714]
- [https://security-tracker.debian.org/tracker/CVE-2026-61714]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-61714.json]
- [https://ubuntu.com/security/notices/USN-8885-1]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [Ubuntu Security Notices (USN)]