Which versions of smtp-test-server-node are malicious?

The following npm versions of smtp-test-server-node are flagged malicious: 99.2.1, 99.2.2. Treat any of these as compromised.

How do I remediate smtp-test-server-node if I installed it?

Remove smtp-test-server-node 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 activity or persistence.

I already installed smtp-test-server-node — how do I know if it already compromised me?

If smtp-test-server-node 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 smtp-test-server-node part of a known attack campaign?

Yes — smtp-test-server-node is associated with the RLMA-2026-05320, RLUA-2026-06492 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 smtp-test-server-node across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for smtp-test-server-node (2 malicious versions).

Malicious package

smtp-test-server-nodenpm

Advisory published Jul 7, 2026Updated Sep 1, 2026

smtp-test-server-node is a confirmed malicious npm package (MAL-2026-7422) that executes malicious code on install (malicious versions 99.2.1, 99.2.2). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in smtp-test-server-node (npm)

MAL-2026-7422

Immediate action

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

npm uninstall smtp-test-server-node

Malicious versions

2 flagged

99.2.199.2.2

Indicators of compromise (SHA-256)

d55ff63037c16c165561b2bd0864c02281e4c933531ad0a9052a0b6a40e8b065

f7093a7b7a197f38a6f0de300353528c623f048d4aad7cac510150ae5130f92d

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for smtp-test-server-node (2 malicious versions).
If you installed it — respond
Remove smtp-test-server-node 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 activity or persistence.
Did it already run?
If smtp-test-server-node 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. smtp-test-server-node on npm has been identified as a malicious package (versions 99.2.1, 99.2.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-05320RLUA-2026-06492

References

github.com

Credits

ReversingLabs · finder

Detect & block this

O3 blocks smtp-test-server-node-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

Explore

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