MalwarePublished 5 Aug 2026Updated 25 Aug 2026

devplatform-spa-plugin-s3-module-loader (npm) · Malicious Code

Affects devplatform-spa-plugin-s3-module-loaderSource GCVE Database

Malicious package : remove devplatform-spa-plugin-s3-module-loader and rotate any secrets on hosts that installed it.

Data as of 26 Oct 2026, 16:15 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-12779

What to do

Remove devplatform-spa-plugin-s3-module-loader 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
npmdevplatform-spa-plugin-s3-module-loader	Affected =35.8.2	Fixed in–

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Description

The npm package devplatform-spa-plugin-s3-module-loader version 35.8.2 contains malicious code that, upon requiring the package, downloads and executes obfuscated payloads from multiple Cloudflare Workers hosts. It writes these payloads to hidden temporary files and executes them on the host system, bypassing normal package functionality. The payload delivery can also fallback to DNS-over-TXT record retrieval if HTTPS delivery is blocked. The malicious behavior is unrelated to the package's stated purpose and is fully controlled and obfuscated by the attacker.

Impact

This malicious package can execute arbitrary code on the host system where it is installed, potentially leading to full system compromise, data theft, or further malware deployment. The payload delivery is stealthy and obfuscated, increasing the risk of undetected compromise. Since the payload is fully controlled by the attacker and can be dynamically fetched or reconstructed, the impact can vary widely depending on the attacker's intent.

Defensive guidance

Users should immediately remove the affected version (=35.8.2) of devplatform-spa-plugin-s3-module-loader from their environments. Avoid installing or using this package version. Monitor for any unexpected network connections to the described Cloudflare Workers hosts or suspicious DNS TXT queries. Check vendor advisories or trusted security sources for updates or official fixes. Consider using trusted package sources and scanning dependencies for malicious code before deployment.

Summary

The devplatform-spa-plugin-s3-module-loader npm package version 35.8.2 includes malicious code that, when loaded, fetches platform-specific payloads from obfuscated Cloudflare Workers URLs. These payloads are assembled at runtime from split string arrays, saved as hidden temporary files (dot-files on Unix, dotnet_diag_*.exe on Windows), permissioned to be executable, and then spawned detached via shell commands. If HTTPS delivery is blocked, the payload is reconstructed from base64-encoded DNS TXT records from attacker-controlled domains. The entire payload delivery mechanism is author-controlled and obfuscated, with cover identifiers to disguise telemetry activity. This behavior is unrelated to the package's advertised functionality as an S3 module loader.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 5 Aug 2026, 16:46 UTC

Technical details

References

Community reviews