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Malicious package

fastly-vcl-language-clientnpm

Advisory published Updated

fastly-vcl-language-client is a confirmed malicious npm package (MAL-2026-14060) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in fastly-vcl-language-client (npm)

MAL-2026-14060
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall fastly-vcl-language-client

What this malware does

The package declares scripts.preinstall = 'node vishu.js', which runs unconditionally on npm install. vishu.js fetches the installer's public IP via api.ipify.org, reads os.hostname(), and collects CI runner environment variables (CI, GITHUB_ACTIONS, GITHUB_WORKFLOW, GITHUB_RUN_ID, GITHUB_RUN_NUMBER, GITHUB_RUN_ATTEMPT) from process.env, then POSTs/GETs the collected data to a hardcoded https://webhook.site/3c201be4-c16d-4e0c-bf9c-ccc50faa8574 endpoint. It additionally performs a DNS lookup of ping-<hostname>.<oast-collaborator-domain> to exfiltrate the hostname via DNS out-of-band. The package ships no real functionality — its metadata describes it as a 'dependency test utility package' and its name resembles an internal Fastly tool, consistent with a dependency-confusion / recon probe targeting build systems that resolve internal package names against public npm.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

2f77be5ce1488e7867223b63fd5c90060e98d6a44325ff2f71bed2b61653d649

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for fastly-vcl-language-client (version 1.0.0).

  2. If you installed it — respond

    fastly-vcl-language-client is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

  3. Did it already run?

    If fastly-vcl-language-client was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. fastly-vcl-language-client on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-017959

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks fastly-vcl-language-client-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

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fastly-vcl-language-client (npm) malicious package — MAL-2026-14060 | O3 Security