CVE catalog
CVE-2026-61721
fluidsynth: CVE-2026-61721
- Severity
- High · CVSS 8
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.19% · Oct 25, 2026
FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.5.0 until 2.5.6, the native DLS loader assigns file-controlled wsmp.loop_start and wsmp.loop_length values to samples without calling fluid_sample_validate() or fluid_sample_sanitize_loop(). A crafted DLS file can place sample loop points beyond the sample buffer, causing out-of-bounds reads during audio rendering, undefined behavior, possible memory disclosure, and denial of service. Builds compiled with the CMake option enable-native-dls set to OFF do not expose the affected parser. 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 | not affected |
| Debian | fluidsynth | bookworm | 2.3.1-2 | not affected |
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 | Not affected | unimportant | Not reported | Not reported |
| Debian | fluidsynth | source | bookworm | Not affected | unimportant | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [fluidsynth]Not affected
Details (2)
2.3.1-2· amd64 · bookwormNot affected
dsa · fluidsynth · debian · bookworm
2.3.1-2· arm64 · bookwormNot affected
dsa · fluidsynth · debian · bookworm
- [libfluidsynth3]Not affected
Source package: [fluidsynth]
Details (2)
2.3.1-2· amd64 · bookwormNot affected
dsa · fluidsynth · debian · bookworm
2.3.1-2· arm64 · bookwormNot affected
dsa · fluidsynth · debian · bookworm
- [libfluidsynth-dev]Not affected
Source package: [fluidsynth]
Details (2)
2.3.1-2· amd64 · bookwormNot affected
dsa · fluidsynth · debian · bookworm
2.3.1-2· arm64 · bookwormNot affected
dsa · fluidsynth · debian · bookworm
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-61721]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-61721]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-61721]
- [https://security-tracker.debian.org/tracker/CVE-2026-61721]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-61721.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]