DEBIAN-CVE-2026-61723
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.
DEBIAN-CVE-2026-61723
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-61723
fluidsynth
Source reference: /affected/0/package/name
- Affected versions
- 2.4.4+dfsg-1
Source reference:
/affected/0/versions2.4.6+dfsg-1Source reference:
/affected/0/versions2.4.7+dfsg-1Source reference:
/affected/0/versions2.4.7+dfsg-2Source reference:
/affected/0/versions2.4.8+dfsg-1Source reference:
/affected/0/versions2.5.0+dfsg-1Source reference:
/affected/0/versions2.5.1+dfsg-1Source reference:
/affected/0/versions2.5.1+dfsg-2Source reference:
/affected/0/versions2.5.2+dfsg-1Source reference:
/affected/0/versions2.5.3+dfsg-1Source reference:
/affected/0/versions2.5.4+dfsg-1Source reference:
/affected/0/versions2.5.5+dfsg-1Source reference:
/affected/0/versions2.5.5+dfsg-2Source reference:
/affected/0/versions - Fixed versions
- 2.5.6+dfsg-1
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.5.6+dfsg-1"
}
]
}
],
"package": {
"name": "fluidsynth",
"purl": "pkg:deb/debian/fluidsynth?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.4.4+dfsg-1",
"2.4.6+dfsg-1",
"2.4.7+dfsg-1",
"2.4.7+dfsg-2",
"2.4.8+dfsg-1",
"2.5.0+dfsg-1",
"2.5.1+dfsg-1",
"2.5.1+dfsg-2",
"2.5.2+dfsg-1",
"2.5.3+dfsg-1",
"2.5.4+dfsg-1",
"2.5.5+dfsg-1",
"2.5.5+dfsg-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-61723.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #15019 · Revision 1
- Added to Heist Feed
- Publisher date