FluidSynth: DLS ptbl Chunk Integer Overflow

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-61723
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 20:17:18 UTC
Updated2026-09-24 21:25:27 UTC
DescriptionFluidSynth 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.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

EPSS: 0.001840000 probability, percentile 0.070650000 (date 2026-09-25)

Problem Types: CWE-190 | CWE-190 CWE-190: Integer Overflow or Wraparound

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
3.1CNADECLARED6.8MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA FluidSynth Fluidsynth affected >= 2.5.0, < 2.5.6 Not specified

References

ReferenceSourceLinkTags
github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6 [email protected] github.com
github.com/FluidSynth/fluidsynth/commit/a2ab32b9c3b9f8845b7254adea73c211... [email protected] github.com
github.com/FluidSynth/fluidsynth/security/advisories/GHSA-r4mc-v3p8-pv47 [email protected] github.com
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