MalwarePublished 5 Aug 2026

claims-domain (npm) · Malicious Code

Affects claims-domainSource GCVE Database

Malicious package : remove claims-domain and rotate any secrets on hosts that installed it.

Data as of 5 Aug 2026, 16:09 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-12613

What to do

Remove claims-domain 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-domain	Affected =35.6.7	Fixed in–

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Description

The npm package 'claims-domain' version 35.6.7 contains malicious code that fetches and executes platform-specific native binaries from obfuscated and untrusted Cloudflare Workers subdomains and fallback domains. The binaries are saved to temporary directories under disguised filenames, given executable permissions, and spawned detached from the main process. This behavior is inconsistent with the package's advertised functionality and is hidden behind obfuscated code and misleading comments.

Impact

This malicious behavior can lead to arbitrary code execution on the host system where the package is installed, potentially compromising system integrity and confidentiality. Since the native binaries are fetched from untrusted and obfuscated sources, they may contain malware or backdoors. The execution is detached, making detection and containment more difficult. No known exploits in the wild are reported yet.

Defensive guidance

Users should avoid using version 35.6.7 of the 'claims-domain' package. Audit and remove this package from projects and replace it with a trusted alternative. Monitor for updates or advisories from the package maintainers or security communities. Since the package fetches and executes untrusted binaries, manual removal and environment cleanup are recommended if this version was used.

Summary

The 'claims-domain' npm package (version 35.6.7) includes malicious functionality where, upon requiring the package, it loads a script that reconstructs destination hostnames from split strings to fetch native binaries from multiple Cloudflare Workers subdomains and fallback Russian domains. These binaries are written to temporary directories with disguised names, permissions are set to executable, and they are launched detached via shell commands. The code uses string concatenation to obscure references to 'child_process' and 'fs.chmodSync' APIs and falsely claims to be an analytics/telemetry SDK. The package's legitimate purpose does not require fetching or executing native binaries from such sources, indicating malicious intent. The delivery method is unpinned, unhashed, and obfuscated, increasing risk.

References

npmjs.com/package/claims-domain/v/35.6.7 (opens in a new tab)

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What to do

Affected software

Description

AI analysisMachine-generated, updated 5 Aug 2026, 16:09 UTC

Technical details

References

Community reviews