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6 vulnerabilities found for fluidsynth by fluidsynth
CVE-2025-56225 (GCVE-0-2025-56225)
Vulnerability from cvelistv5 – Published: 2026-01-09 00:00 – Updated: 2026-01-12 16:24
VLAI
Summary
fluidsynth-2.4.6 and earlier versions is vulnerable to Null pointer dereference in fluid_synth_monopoly.c, that can be triggered when loading an invalid midi file.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-476 - NULL Pointer Dereference
Assigner
References
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CVE-2025-68617 (GCVE-0-2025-68617)
Vulnerability from cvelistv5 – Published: 2025-12-23 22:41 – Updated: 2025-12-24 14:53
VLAI
Title
Use after free in fluidsynth
Summary
FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From versions 2.5.0 to before 2.5.2, a race condition during unloading of a DLS file can trigger a heap-based use-after-free. A concurrently running thread may be pending to unload a DLS file, leading to use of freed memory, if the synthesizer is being concurrently destroyed, or samples of the (unloaded) DLS file are concurrently used to synthesize audio. This issue has been patched in version 2.5.2. The problem will not occur, when explicitly unloading a DLS file (before synth destruction), provided that at the time of unloading, no samples of the respective file are used by active voices. The problem will not occur in versions of FluidSynth that have been compiled without native DLS support.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-416 - Use After Free
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/FluidSynth/fluidsynth/security… | x_refsource_CONFIRM |
| https://github.com/FluidSynth/fluidsynth/issues/1717 | x_refsource_MISC |
| https://github.com/FluidSynth/fluidsynth/issues/1728 | x_refsource_MISC |
| https://github.com/FluidSynth/fluidsynth/commit/6… | x_refsource_MISC |
| https://github.com/FluidSynth/fluidsynth/commit/9… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| FluidSynth | fluidsynth |
Affected:
>= 2.5.0, < 2.5.2
|
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CVE-2021-21417 (GCVE-0-2021-21417)
Vulnerability from cvelistv5 – Published: 2021-04-29 17:10 – Updated: 2024-08-03 18:09
VLAI
Title
Use after free in fluidsynth
Summary
fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.
Severity
7.2 (High)
CWE
- CWE-416 - {"CWE-416":"Use After Free"}
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/FluidSynth/fluidsynth/issues/808 | x_refsource_MISC |
| https://github.com/FluidSynth/fluidsynth/pull/810 | x_refsource_MISC |
| https://github.com/FluidSynth/fluidsynth/security… | x_refsource_CONFIRM |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| FluidSynth | fluidsynth |
Affected:
< 2.1.8
|
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CVE-2025-56225 (GCVE-0-2025-56225)
Vulnerability from nvd – Published: 2026-01-09 00:00 – Updated: 2026-01-12 16:24
VLAI
Summary
fluidsynth-2.4.6 and earlier versions is vulnerable to Null pointer dereference in fluid_synth_monopoly.c, that can be triggered when loading an invalid midi file.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-476 - NULL Pointer Dereference
Assigner
References
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CVE-2025-68617 (GCVE-0-2025-68617)
Vulnerability from nvd – Published: 2025-12-23 22:41 – Updated: 2025-12-24 14:53
VLAI
Title
Use after free in fluidsynth
Summary
FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From versions 2.5.0 to before 2.5.2, a race condition during unloading of a DLS file can trigger a heap-based use-after-free. A concurrently running thread may be pending to unload a DLS file, leading to use of freed memory, if the synthesizer is being concurrently destroyed, or samples of the (unloaded) DLS file are concurrently used to synthesize audio. This issue has been patched in version 2.5.2. The problem will not occur, when explicitly unloading a DLS file (before synth destruction), provided that at the time of unloading, no samples of the respective file are used by active voices. The problem will not occur in versions of FluidSynth that have been compiled without native DLS support.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-416 - Use After Free
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/FluidSynth/fluidsynth/security… | x_refsource_CONFIRM |
| https://github.com/FluidSynth/fluidsynth/issues/1717 | x_refsource_MISC |
| https://github.com/FluidSynth/fluidsynth/issues/1728 | x_refsource_MISC |
| https://github.com/FluidSynth/fluidsynth/commit/6… | x_refsource_MISC |
| https://github.com/FluidSynth/fluidsynth/commit/9… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| FluidSynth | fluidsynth |
Affected:
>= 2.5.0, < 2.5.2
|
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CVE-2021-21417 (GCVE-0-2021-21417)
Vulnerability from nvd – Published: 2021-04-29 17:10 – Updated: 2024-08-03 18:09
VLAI
Title
Use after free in fluidsynth
Summary
fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.
Severity
7.2 (High)
CWE
- CWE-416 - {"CWE-416":"Use After Free"}
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/FluidSynth/fluidsynth/issues/808 | x_refsource_MISC |
| https://github.com/FluidSynth/fluidsynth/pull/810 | x_refsource_MISC |
| https://github.com/FluidSynth/fluidsynth/security… | x_refsource_CONFIRM |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| FluidSynth | fluidsynth |
Affected:
< 2.1.8
|
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