TI-2026-44180 Aliases CVE-2026-61722

FluidSynth: DLS Articulation Chunk Integer Overflow

LOW 29CWE-190Published 2026-09-18 · Updated 2026-09-22

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · Low · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00198 9th percentileScored 2026-11-07

Fix Fixed fluidsynth (FluidSynth): 2.5.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
FluidSynth	fluidsynth	2.5.0 to before 2.5.6	2.5.6	Patch available	CNA

fluidsynth VendorFluidSynth Affected 2.5.0 to before 2.5.6 Fixed in 2.5.6 Patch available CNA

Remediation

Fix · CNA fluidsynth (FluidSynth) Fixed in 2.5.6

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-61722

References

Other 3

TI-2025-35279 fluidsynth-2.4.6 and earlier versions is vulnerable to Null pointer dereference in… CVSS 3.1HIGH 7.5
TI-2025-42135 Use after free in fluidsynth CVSS 3.1HIGH 7.0
TI-2026-74907 Out-of-bounds write in FluidSynth SoundFont modulator handling CVSS 4.0MEDIUM 6.9
TI-2026-41957 FluidSynth: Heap-based buffer overrun CVSS 3.1CRITICAL 9.8
TI-2026-44176 FluidSynth: Heap Buffer Overflow in MIDI Player CVSS 3.1HIGH 7.8
TI-2026-44179 FluidSynth: Heap-based buffer overrun for DLS samples CVSS 3.1HIGH 8.0

See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences