FluidSynth: DLS Articulation Chunk Integer Overflow

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-61722
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 20:17:18 UTC
Updated2026-09-23 18:28:25 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 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.

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: 0.001980000 probability, percentile 0.084240000 (date 2026-09-24)

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/4d7084fca7c876f5d738498b4917a39f... [email protected] github.com
github.com/FluidSynth/fluidsynth/security/advisories/GHSA-hp72-35pr-6h6r [email protected] github.com
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