mouse5212-super-formatter has 5 versions on the npm registry flagged in 1 incident we track. Other versions of this package are not implicated - only the exact versions listed below were named by the source advisories.
Check what you actually have installed with npm ls mouse5212-super-formatter.
On 2026-05-26 a fresh npm publisher pushed five versions of mouse5212-super-formatter (1.0.0–1.0.4) that exfiltrate files from Claude AI's /mnt/user-data directory to an attacker GitHub repo via a hard-coded PAT. Disclosed by OX Security on 2026-05-27 ("Malware-Slop"); ~676 downloads before npm unpublished all versions.
Versions named here: 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4
Treat the machine as compromised rather than simply upgrading. Packages in these incidents typically execute at install time, so the payload has already run with whatever credentials were in the environment.
mouse5212-super-formatter is one of many packages in these incidents, and it is usually pulled in as a transitive dependency rather than one you installed directly. Paste your package-lock.json to check every dependency at once - it runs in your browser and nothing is uploaded.
Version data comes from the public advisories cited on each incident page. We list only versions those advisories name - we don't infer additional ones. Think this is wrong or incomplete? Tell us.
