Vulnerability · Published Jan 9, 2026 · Assigned by mitre
CVE-2025-56225
High 7.5
In plain English
A high-severity null pointer dereference in the fluidsynth package (Debian). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 60.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | fluidsynth | no fix listed | DEBIAN-CVE-2025-56225 |
| Debian:13 | fluidsynth | 2.4.4+dfsg-1+deb13u2 | DEBIAN-CVE-2025-56225 |
| Debian:14 | fluidsynth | 2.4.7+dfsg-1 | DEBIAN-CVE-2025-56225 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H