Which versions of @tc-core/sso-service are malicious?

The following npm versions of @tc-core/sso-service are flagged malicious: 0.0.0-defensive-callback. Treat any of these as compromised.

How do I remediate @tc-core/sso-service if I installed it?

Remove @tc-core/sso-service 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 @tc-core/sso-service — how do I know if it already compromised me?

If @tc-core/sso-service 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 @tc-core/sso-service part of a known attack campaign?

Yes — @tc-core/sso-service is associated with the RLMA-2026-04788, RLUA-2026-05933 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 @tc-core/sso-service across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for @tc-core/sso-service (version 0.0.0-defensive-callback).

Malicious package

@tc-core/sso-servicenpm

Advisory published Jul 7, 2026Updated Sep 1, 2026

@tc-core/sso-service is a confirmed malicious npm package (MAL-2026-7095) that executes malicious code on install (malicious version 0.0.0-defensive-callback). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @tc-core/sso-service (npm)

MAL-2026-7095

Immediate action

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

npm uninstall @tc-core/sso-service

Malicious versions

1 flagged

0.0.0-defensive-callback

Indicators of compromise (SHA-256)

3eef7b15f06e4f121a5c726d37c882a293f3be966a6e1465e0ad2310bc1b65f3

f14951a5804af62546c4f231096e9cd3372caa1159a432b30d9c1e994d1ffe06

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for @tc-core/sso-service (version 0.0.0-defensive-callback).
If you installed it — respond
Remove @tc-core/sso-service 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 @tc-core/sso-service 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. @tc-core/sso-service on npm has been identified as a malicious package (version 0.0.0-defensive-callback flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-04788RLUA-2026-05933

References

github.com

Credits

ReversingLabs · finder

Detect & block this

O3 blocks @tc-core/sso-service-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

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