CVE catalog
CVE-2026-61723
fluidsynth: CVE-2026-61723
- 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
- 0.18% · 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 ptbl chunks with the unsigned expression cues * 4 + cbsize without checking whether the multiplication and addition fit in 32 bits. A crafted DLS file can supply a large cues value that wraps the expression and passes the chunk-size check, causing poolcues.resize(cues) to request approximately four gigabytes and the parser to read billions of entries beyond the chunk boundary. The excessive allocation and invalid reads can cause denial of service. Builds with enable-native-dls set to OFF are not exposed. 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-2026-61723]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-61723]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-61723]
- [https://security-tracker.debian.org/tracker/CVE-2026-61723]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-61723.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]