y0syoh (npm) · Malicious Code
Affects y0syohSource GCVE Database
Malicious package : remove y0syoh and rotate any secrets on hosts that installed it.
Data as of 3 Nov 2026, 20:16 UTC
Malicious package
Published to npm · OSV MAL-2026-18578
What to do
Remove y0syoh from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| npmy0syoh | Affected– | Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
The y0syoh package on npm contains malicious code that compromises any computer on which it is installed or running. The compromise is severe enough that all secrets and keys stored on the affected system should be considered exposed and require immediate rotation from a secure, separate machine. Removal of the package alone may not fully eliminate the malicious presence due to potential additional malware installed by the package.