Which versions of @openzeppelin-5/contracts are malicious?

The following npm versions of @openzeppelin-5/contracts are flagged malicious: 1.0.0, 1.0.1. Treat any of these as compromised.

How do I remediate @openzeppelin-5/contracts if I installed it?

@openzeppelin-5/contracts 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.

I already installed @openzeppelin-5/contracts — how do I know if it already compromised me?

If @openzeppelin-5/contracts was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

Is @openzeppelin-5/contracts part of a known attack campaign?

Yes — @openzeppelin-5/contracts is associated with the IN-MAL-2026-017360, IN-MAL-2026-017362 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find @openzeppelin-5/contracts across my projects, lockfiles, and CI pipelines?

Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for @openzeppelin-5/contracts (2 malicious versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging @openzeppelin-5/contracts across your stack and pipelines.

Malicious package

@openzeppelin-5/contractsnpm

@openzeppelin-5/contracts is a confirmed malicious npm package (MAL-2026-13738) that steals credentials and exfiltrates sensitive data (malicious versions 1.0.0, 1.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @openzeppelin-5/contracts (npm)

MAL-2026-13738

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall @openzeppelin-5/contracts

What this malware does

Package name typosquats @openzeppelin/contracts. package.json declares both preinstall and postinstall as node index.js || true, so the payload auto-executes on npm install. index.js harvests process.env entries matching KEY|TOKEN|SECRET|MNEMONIC|WALLET|AWS|GITHUB|NPM and reads installer-side credential files including ~/.aws/credentials, ~/.ssh/id_rsa, ~/.ssh/id_ed25519, ~/.kube/config, ~/.docker/config.json, ~/.netrc, ~/.npmrc, ~/.git-credentials, gcloud/solana/sui/foundry keystores, and local.env files. The bundle is POSTed to a hardcoded webhook.site endpoint (path 326b0891-2093-4800-a4c1-686ce3e07b09) via a detached child process spawned with a randomized 60–240 second delay to outlive install-time scanning windows. A hostname regex (/^(scan-|detonation|sandbox|ubuntu-fc-uvm)/i) throws early on known sandbox/scanner hosts as anti-analysis gating.

Malicious versions

2 flagged

1.0.01.0.1

Indicators of compromise (SHA-256)

078ff524fafdb7c803081834abe8cf4678931b6f735fc695c8ef1ad339748e8f

800da818da3fee0353766227eafcd43c0c7cf7fd0126af5ded48b7c1ba522e21

Detection & response playbook

Credential / info stealer

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for @openzeppelin-5/contracts (2 malicious versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging @openzeppelin-5/contracts across your stack and pipelines.
If you installed it — respond
@openzeppelin-5/contracts 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.
Did it already run?
If @openzeppelin-5/contracts was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks @openzeppelin-5/contracts before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. @openzeppelin-5/contracts on npm has been identified as a malicious package (versions 1.0.0, 1.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-017360IN-MAL-2026-017362

References

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks @openzeppelin-5/contracts-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

All malware advisories How O3 detects malware Vulnerability database