MalwarePublished 29 Jun 2026Updated 21 Aug 2026

yastatic-s3 (npm) · Malicious Code

Affects yastatic-s3Source GCVE Database

Malicious package : remove yastatic-s3 and rotate any secrets on hosts that installed it.

Data as of 21 Aug 2026, 16:28 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-6586

What to do

Remove yastatic-s3 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
npmyastatic-s3	Affected =0.1.0	Fixed in–

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Description

The yastatic-s3 npm package (version 0.1.0) is a malicious package that mimics Yandex's yastatic namespace. On installation, it performs an unconditional HTTP GET request to a hardcoded IP address, sending limited information about the package but no sensitive environment data or code. Despite this limited data transmission, the package is considered fully compromising any system where it is installed, with recommendations to rotate all secrets and keys and remove the package. There is no confirmed patch or fix available.

Impact

Installation of yastatic-s3 version 0.1.0 can lead to full compromise of the affected system. While the package itself only sends minimal information about the package installation to a remote endpoint, the malware source indicates that the presence of this package implies potential full control by an attacker. This necessitates immediate rotation of all secrets and keys stored on the system and removal of the package. There is no indication that the package fetches or executes additional malicious code during installation, but the risk of compromise remains high.

Defensive guidance

The package should be removed immediately from any affected system. All secrets and keys stored on the compromised system should be rotated from a different, trusted machine. Due to the potential full compromise, additional forensic analysis and remediation may be necessary. Monitor for any signs of persistent malicious activity beyond the package itself.

Summary

The yastatic-s3 package version 0.1.0 is a namespace-squatting malicious npm package that, upon installation, executes a postinstall script performing a plain HTTP GET request to a hardcoded IP endpoint with query parameters containing only the package name, version, and a fixed nonce. It does not read or transmit environment variables, filesystem contents, credentials, or host identifiers, nor does it fetch or execute remote code. However, the package acts as an install-time beacon revealing internal install activity to a third party. According to a malware source, any system with this package installed should be considered fully compromised, with all secrets and keys rotated and the package removed, though removal may not eliminate all malicious software.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 21 Aug 2026, 16:28 UTC

Technical details

References

Community reviews