Which versions of ultra-fast-rb are malicious?

The following RubyGems versions of ultra-fast-rb are flagged malicious: 0.0.1. Treat any of these as compromised.

How do I remediate ultra-fast-rb if I installed it?

Remove ultra-fast-rb 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 ultra-fast-rb — how do I know if it already compromised me?

If ultra-fast-rb 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 ultra-fast-rb part of a known attack campaign?

Yes — ultra-fast-rb is associated with the RLMA-2026-05762 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 ultra-fast-rb across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for ultra-fast-rb (version 0.0.1).

Malicious package

ultra-fast-rbRubyGems

Advisory published Aug 24, 2026Updated Sep 1, 2026

ultra-fast-rb is a confirmed malicious RubyGems package (MAL-2026-15795) that executes malicious code on install (malicious version 0.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in ultra-fast-rb (RubyGems)

MAL-2026-15795

Immediate action

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

gem uninstall ultra-fast-rb

Malicious versions

1 flagged

0.0.1

Indicators of compromise (SHA-256)

cfbc21dc305d11c2fc3b2bbdbebc5f4daa513db0079c8ffc5646c9b2a51900eb

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for ultra-fast-rb (version 0.0.1).
If you installed it — respond
Remove ultra-fast-rb 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 ultra-fast-rb 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. ultra-fast-rb on RubyGems has been identified as a malicious package (version 0.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-05762

Credits

ReversingLabs · finder

Detect & block this

O3 blocks ultra-fast-rb-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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