SlowShield is a free, open-source proxy for package managers protecting teams of all sizes from supply chain attacks.slowshield.org SwitzerlandJoined October 2026
[email protected] put a Shai-Hulud worm on npm
It was gone in under three hours. The malware advisories arrived after that.
SlowShield holds new releases back for 7 days by default, for npm, PyPI, Go, Maven, Cargo and container images.
slowshield.org
🛑 Removing the npm package may not remove the malware.
Compromised tensorlake v0.5.144 shipped a Shai-Hulud worm designed to steal GitHub/AWS credentials, persist on hosts, and republish infected packages.
It's off npm. Installed it? Remove it and rotate credentials.
Read -
Aug 20: arrayref (245M downloads) shipped 0.3.10 from a likely compromised account. Its one new dependency ran a remote payload at build time. Live 86 minutes.
SlowShield now covers Rust. With a 7-day delay, cargo would never have installed it.
thehackernews.com/2026/08/rust-s…
We just added protection against Java and Go supply-chain attacks to SlowShield.
Shai-Hulud v2 hit Maven Central for under two days. A 7-day hold keeps that out: thehackernews.com/2025/11/shai-h…
We use Go and Java only lightly at @squirro. Feedback welcome: github.com/squirro/slowsh…
subql/common 5.8.3 shipped a credential stealer yesterday, through the project's own trusted-publishing pipeline. It ran on import and reached users through ~5.8.2 ranges. OSV flagged it ~2h later.
SlowShield's 7-day delay would have held it back.
stepsecurity.io/blog/subql-eco…
Try it on your laptop, nothing kept after you stop it:
docker run --rm -p 127.0.0.1:8080:8080 ghcr.io/squirro/slowsh…
The dashboard is at http://localhost:8080, and its Setup page has the settings for pip, uv, npm, go and the rest.
Patience is a great malware scanner.
SlowShield: a free, open-source proxy for Python, JavaScript and Go packages. New releases are held back for 7 days by default, known malware is blocked, and every download is verified.
More languages coming soon:
slowshield.org
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