claims-format-date (npm) · Malicious Code
Affects claims-format-dateSource GCVE Database
Malicious package : remove claims-format-date and rotate any secrets on hosts that installed it.
Data as of 5 Aug 2026, 16:10 UTC
Malicious package
Published to npm · OSV MAL-2026-12616
What to do
Remove claims-format-date 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-format-date | Affected
| Fixed in– |
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Description
The npm package claims-format-date version 35.6.5 contains malicious code that auto-executes a binary dropper upon being required. It downloads platform-specific binaries from obfuscated Cloudflare Workers hosts and fallback domains, writes them to temporary directories under disguised names, sets executable permissions, and executes them detached from the main process. The package uses runtime string concatenation to evade static analysis and includes a second dropper disguised as an analytics SDK. This package mimics legitimate date-formatting utilities but performs remote payload execution immediately on load.