CVE-2026-111123
FluidSynth through 2.6.1 Out-of-Bounds Write via SoundFont Modulator Destination
FluidSynth through 2.6.1 contains an out-of-bounds write vulnerability that allows attackers to corrupt heap and stack memory by supplying unvalidated SoundFont modulator destination values. Attackers can craft an SF2 file with PMOD/IMOD destinations of 63 to 255 that, when loaded and played, write past the voice generator array and updated_gen_bit, causing memory corruption and crashes.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Passive
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
FluidSynth through 2.6.1 Out-of-Bounds Write via SoundFont Modulator Destination
FluidSynth through 2.6.1 contains an out-of-bounds write vulnerability that allows attackers to corrupt heap and stack memory by supplying unvalidated SoundFont modulator destination values. Attackers can craft an SF2 file with PMOD/IMOD destinations of 63 to 255 that, when loaded and played, write past the voice generator array and updated_gen_bit, causing memory corruption and crashes.
- Record
CVE-2026-111123- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H - Weakness
- CWE-787
- Updated
- 2026-11-02
EUVDEUVD-2026-102354
FluidSynth through 2.6.1 contains an out-of-bounds write vulnerability that allows attackers to corrupt heap and stack memory by supplying unvalidated SoundFont modulator destination values. Attackers can craft an SF2 file with PMOD/IMOD destinations of 63 to 255 that, when loaded and played, write past the voice generator array and updated_gen_bit, causing memory corruption and crashes.
- Record
EUVD-2026-102354- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-7hc9-ggv2-4w8c
FluidSynth through 2.6.1 contains an out-of-bounds write vulnerability that allows attackers to...
FluidSynth through 2.6.1 contains an out-of-bounds write vulnerability that allows attackers to corrupt heap and stack memory by supplying unvalidated SoundFont modulator destination values. Attackers can craft an SF2 file with PMOD/IMOD destinations of 63 to 255 that, when loaded and played, write past the voice generator array and updated_gen_bit, causing memory corruption and crashes.
- Record
GHSA-7hc9-ggv2-4w8c- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H - Weakness
- CWE-787
- Updated
- 2026-11-02
NVD
FluidSynth through 2.6.1 contains an out-of-bounds write vulnerability that allows attackers to corrupt heap and stack memory by supplying unvalidated SoundFont modulator destination values. Attackers can craft an SF2 file with PMOD/IMOD destinations of 63 to 255 that, when loaded and played, write past the voice generator array and updated_gen_bit, causing memory corruption and crashes.
- Record
CVE-2026-111123- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H - Weakness
- CWE-787
- Updated
- 2026-11-02
OSV
FluidSynth through 2.6.1 Out-of-Bounds Write via SoundFont Modulator Destination
FluidSynth through 2.6.1 contains an out-of-bounds write vulnerability that allows attackers to corrupt heap and stack memory by supplying unvalidated SoundFont modulator destination values. Attackers can craft an SF2 file with PMOD/IMOD destinations of 63 to 255 that, when loaded and played, write past the voice generator array and updated_gen_bit, causing memory corruption and crashes.
- Record
CVE-2026-111123- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-787
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-111123
FluidSynth through 2.6.1 contains an out-of-bounds write vulnerability that allows attackers to corrupt heap and stack memory by supplying unvalidated SoundFont modulator destination values. Attackers can craft an SF2 file with PMOD/IMOD destinations of 63 to 255 that, when loaded and played, write past the voice generator array and updated_gen_bit, causing memory corruption and crashes.
- Record
DEBIAN-CVE-2026-111123- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-111123
FluidSynth through 2.6.1 contains an out-of-bounds write vulnerability that allows attackers to corrupt heap and stack memory by supplying unvalidated SoundFont modulator destination values. Attackers can craft an SF2 file with PMOD/IMOD destinations of 63 to 255 that, when loaded and played, write past the voice generator array and updated_gen_bit, causing memory corruption and crashes.
- Record
UBUNTU-CVE-2026-111123- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
fluidsynthDebian:12 |
All versions, plus listed versions 2.3.1-22.3.2-12.3.3-12.3.3-22.3.3-2.1 Show 30 moreShow less2.3.4-12.3.5-12.3.6-12.4.0-12.4.0-1~hurd.12.4.0-1~hurd.22.4.2-12.4.3+dfsg-12.4.3+dfsg-22.4.3+dfsg-32.4.3+dfsg-42.4.3-12.4.4+dfsg-12.4.6+dfsg-12.4.7+dfsg-12.4.7+dfsg-22.4.8+dfsg-12.5.0+dfsg-12.5.1+dfsg-12.5.1+dfsg-22.5.2+dfsg-12.5.3+dfsg-12.5.4+dfsg-12.5.5+dfsg-12.5.5+dfsg-22.5.6+dfsg-12.5.7+dfsg-12.6.0+dfsg-12.6.1+dfsg-12.6.1+dfsg-2 |
None known |
fluidsynthDebian:13 |
All versions, plus listed versions 2.4.4+dfsg-12.4.4+dfsg-1+deb13u12.4.4+dfsg-1+deb13u22.4.4+dfsg-1+deb13u32.4.6+dfsg-1 Show 16 moreShow less2.4.7+dfsg-12.4.7+dfsg-22.4.8+dfsg-12.5.0+dfsg-12.5.1+dfsg-12.5.1+dfsg-22.5.2+dfsg-12.5.3+dfsg-12.5.4+dfsg-12.5.5+dfsg-12.5.5+dfsg-22.5.6+dfsg-12.5.7+dfsg-12.6.0+dfsg-12.6.1+dfsg-12.6.1+dfsg-2 |
None known |
fluidsynthDebian:14 |
All versions, plus listed versions 2.4.4+dfsg-12.4.6+dfsg-12.4.7+dfsg-12.4.7+dfsg-22.4.8+dfsg-1 Show 13 moreShow less2.5.0+dfsg-12.5.1+dfsg-12.5.1+dfsg-22.5.2+dfsg-12.5.3+dfsg-12.5.4+dfsg-12.5.5+dfsg-12.5.5+dfsg-22.5.6+dfsg-12.5.7+dfsg-12.6.0+dfsg-12.6.1+dfsg-12.6.1+dfsg-2 |
None known |
fluidsynthUbuntu:Pro:14.04:LTS |
All versions, plus listed versions 1.1.6-21.1.6-2ubuntu0.1~esm1 |
None known |
fluidsynthUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 1.1.6-2build11.1.6-31.1.6-3ubuntu0.1~esm1 |
None known |
fluidsynthUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 1.1.6-41.1.8-11.1.8-21.1.8-31.1.9-11.1.9-1ubuntu0.1~esm1 |
None known |
fluidsynthUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 1.1.11-41.1.11-4ubuntu12.1.0-12.1.1-22.1.1-2ubuntu0.1~esm1 |
None known |
fluidsynthUbuntu:Pro:22.04:LTS |
All versions, plus listed versions 2.1.7-1.12.2.4-22.2.5-12.2.5-1ubuntu0.1~esm1 |
None known |
fluidsynthUbuntu:Pro:24.04:LTS |
All versions, plus listed versions 2.3.3-2.12.3.4-12.3.4-1build12.3.4-1build22.3.4-1build32.3.4-1ubuntu0.1~esm1 |
None known |
fluidsynthUbuntu:26.10 |
All versions, plus listed versions 2.4.8+dfsg-12.5.6+dfsg-12.5.7+dfsg-12.6.0+dfsg-1 |
None known |
fluidsynthUbuntu:Pro:26.04:LTS |
All versions, plus listed versions 2.4.7+dfsg-22.4.8+dfsg-12.4.8+dfsg-1ubuntu0.1~esm1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-111123 is a medium vulnerability (CVSS 6.9) in Fluidsynth, published October 15, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.19%, the 9th percentile. No source names a fixed version.
References
hackmd.io/@haind-pwn/fluidsynth-sf2-modulator-dest-generator-oob-write
github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.c
vulncheck.com/advisories/fluidsynth-through-2.6.1-out-of-bounds-write-via-soundfont-modulator-destination
nvd.nist.gov/vuln/detail/CVE-2026-111123