Which versions of @mastra/langfuse are malicious?

The following npm versions of @mastra/langfuse are flagged malicious: 1.3.6. Treat any of these as compromised.

How do I remediate @mastra/langfuse if I installed it?

Remove @mastra/langfuse from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound network activity or persistence. Use O3 Security's dependency scanner to confirm the package and its artifacts are fully purged across your stack.

Is @mastra/langfuse part of a known attack campaign?

Yes — @mastra/langfuse is associated with the GHSA-5v2f-vg69-mmhv campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

Can O3 Security detect @mastra/langfuse in my codebase?

Yes. O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, blocking @mastra/langfuse and packages like it before any post-install script runs.

Malicious package

@mastra/langfusenpm

Malicious code in @mastra/langfuse (npm) Remove it immediately and rotate any exposed credentials.

MAL-2026-5952

Immediate action

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

npm uninstall @mastra/langfuse

What this malware does

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

1.3.6

Indicators of compromise (SHA-256)

7618b3dc13a76bea19bb632c59d32628bab37d9f3922fd4141b3897306f8a991

a25d8d06344088accc0ec6ace993a642b5b142c77817b1be51e1a4fc079addd4

Frequently asked questions

No. @mastra/langfuse on npm has been identified as a malicious package (version 1.3.6 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

GHSA-5v2f-vg69-mmhv

References

github.com

Scan your dependencies

O3 Security blocks malicious packages like this at install time and in CI.

Supply-chain protection