OpenSSF/OSV advisory MAL-2026-11483 confirms this npm version as malicious. The package appears to be a small date-formatting utility. No credential access, no install-time or import-time network activity, no lifecycle scripts fetching remote content, no obfuscated payloads, and no destinations consistent with exfiltration or command-and-control were observed...
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in simple-date-formatter-util (npm)
Details
The package appears to be a small date-formatting utility. No credential access, no install-time or import-time network activity, no lifecycle scripts fetching remote content, no obfuscated payloads, and no destinations consistent with exfiltration or command-and-control were observed. Nothing in the shipped contents matches known supply-chain attack fingerprints (installer-secret reads, dropper patterns, silent-relay of caller data, dependency-chain lure).
## Source: ghsa-malware (331277f77984c01034871b322154a0430093a1a087c2e3b48d18a4cd1c7254ac) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
Decision reason
OpenSSF Malicious Packages via OSV confirms simple-date-formatter-util@1.0.0 as malicious (MAL-2026-11483): Malicious code in simple-date-formatter-util (npm)