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TI-2026-44181 Aliases CVE-2026-61723

FluidSynth: DLS ptbl Chunk Integer Overflow

Priority LOW 29CWE-190Published · Updated

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 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00184 8th 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

VendorProductAffected versionsFixed inStatusSource
FluidSynthfluidsynth2.5.0 to before 2.5.62.5.6Patch availableCNA
  • 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

  1. 2026-10-02 Threatist record created from CVE-2026-61723

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