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Fencer Vulns
high 7.5

CVE-2025-56225 json

fluidsynth-2.4.6 and earlier versions is vulnerable to Null pointer dereference in fluid_synth_monopoly.c, that can be triggered when loadi…

published 2026-01-09 10 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-1717

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

fluidsynth-2.4.6 and earlier versions is vulnerable to Null pointer dereference in fluid_synth_monopoly.c, that can be triggered when loading an invalid midi file.

Patch / fix

  • fluidsynth Debian 13 2.4.4+dfsg-1+deb13u2
  • fluidsynth Debian 14 2.4.7+dfsg-1

debian advisories DEBIAN-CVE-2025-56225

  • musescore openSUSE Tumbleweed 4.7.4-1.1
  • fluidsynth openSUSE Leap 16.0 2.3.5-160000.3.1
  • fluidsynth openSUSE Tumbleweed 2.5.2-2.1

opensuse advisories openSUSE-SU-2026:11496-1openSUSE-SU-2026:20291-1openSUSE-SU-2026:10038-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-56225 updated cvss 5.5

fluidsynth: FluidSynth: Denial of Service via invalid MIDI file processing

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/FluidSynth/fluidsynth/issues/1602 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.