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CVE-2025-55204VulnerabilityPublished

CVE-2025-55204: staniel359 muffon · Code Injection

Affects staniel359 muffonSource CVE Database V5

0

Not known to be exploited · CVSS 8.8 High : upgrade to 2.3.0 soon.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.7% chance of exploitation in 30 days – higher than 53% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2.3.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 5 Jan 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

What to do

Upgrade muffon and staniel359/muffon to 2.3.0.

Affected software

ProductAffectedFixed in
staniel359muffonAffected
  • <2.3.0
Fixed in
  • 2.3.0
GitHubstaniel359/muffonpkg:github/staniel359/muffonOther threatsAffected
  • <2.3.0
Fixed in
  • 2.3.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Organizations should immediately upgrade all Muffon clients to version 2.3.0 or later to apply the official patch. Until patching is complete, implement network-level controls to block or monitor traffic involving the 'muffon://' URL scheme if possible. Educate users about the risks of clicking unknown or suspicious links, especially those with uncommon URL schemes. Deploy endpoint detection and response (EDR) solutions capable of detecting anomalous process launches triggered by URL handlers. Employ web filtering to block access to known malicious or untrusted websites that could host exploit links. Regularly audit installed software to identify vulnerable versions of Muffon and remove or isolate affected systems if patching is delayed. Consider application whitelisting to prevent unauthorized code execution initiated by URL handlers. Finally, monitor logs for unusual activity related to Muffon processes or network connections.

Description

muffon is a cross-platform music streaming client for desktop. Versions prior to 2.3.0 have a one-click Remote Code Execution (RCE) vulnerability in. An attacker can exploit this issue by embedding a specially crafted `muffon://` link on any website they control. When a victim visits the site or clicks the link, the browser triggers Muffon’s custom URL handler, causing the application to launch and process the URL. This leads to RCE on the victim's machine without further interaction. Version 2.3.0 patches the issue.

References

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