Which versions of caldryn are malicious?

The following npm versions of caldryn are flagged malicious: 1.0.0. Treat any of these as compromised.

How do I remediate caldryn if I installed it?

caldryn 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 caldryn — how do I know if it already compromised me?

If caldryn 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.

Is caldryn part of a known attack campaign?

Yes — caldryn is associated with the GHSA-h9c8-8wq8-r6q2, IN-MAL-2026-013383 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 caldryn across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for caldryn (version 1.0.0).

Malicious package

caldrynnpm

Advisory published Jul 22, 2026Updated Aug 5, 2026

caldryn is a confirmed malicious npm package (MAL-2026-11008) 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 caldryn (npm)

MAL-2026-11008

Immediate action

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

npm uninstall caldryn

What this malware does

No a static rule matches and no traced behavioral findings were produced for this package version. There is no observed evidence of install-time or import-time code execution beyond ordinary package loading, no exfiltration primitives, no hardcoded external network destinations, no credential or filesystem reconnaissance, and no lifecycle scripts fetching or executing remote content.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

5c9fe8dc148d9aeea38bde81a4c2c467769c550580a8394dbbef1152aea36ca6

95c9be7dd8b0d1fe026c48f500d432db06ebfb7bbb0721e3b1426cd29940fd1e

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for caldryn (version 1.0.0).
If you installed it — respond
caldryn 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 caldryn 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. caldryn 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

GHSA-h9c8-8wq8-r6q2IN-MAL-2026-013383

References

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks caldryn-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