claims-to-iso-string-with-timezone (npm) · Malicious Code
Affects claims-to-iso-string-with-timezoneSource GCVE Database
Malicious package : remove claims-to-iso-string-with-timezone and rotate any secrets on hosts that installed it.
Data as of 5 Aug 2026, 16:16 UTC
Malicious package
Published to npm · OSV MAL-2026-12644
What to do
Remove claims-to-iso-string-with-timezone 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 |
|---|---|---|
| npmclaims-to-iso-string-with-timezone | 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 npm package claims-to-iso-string-with-timezone version 35.7.2 contains malicious code that downloads and executes a platform-specific binary from obfuscated, author-controlled endpoints. This binary is saved to temporary directories with names mimicking legitimate dotnet diagnostic tools and executed detached from the main process. The malicious behavior is hidden in the _init.js file loaded by index.js, while the package superficially appears to be a harmless date/timezone formatting utility.