CVE catalog
CVE-2026-61722
fluidsynth: CVE-2026-61722
- Severity
- Medium · CVSS 6.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.20% · 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 parser validates articulation chunks using the unsigned expression cbsize + connblocks * 12 without first ensuring that the multiplication and addition fit in 32 bits. A crafted DLS file can supply a large connblocks value that wraps the expression and bypasses the chunk-size check, after which the parser performs approximately one billion 12-byte iterations beyond the chunk boundary. The excessive processing and invalid reads can cause denial of service. Builds with the CMake option enable-native-dls set to OFF do not expose the 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 |
| 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 | vulnerable |
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-2026-61722]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-61722]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-61722]
- [https://security-tracker.debian.org/tracker/CVE-2026-61722]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-61722.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]