MalwarePublished 6 Aug 2026

@ccfly/setup-linux-arm64 (npm) · Malicious Code

Affects @ccfly/setup-linux-arm64Source GCVE Database

Malicious package : remove @ccfly/setup-linux-arm64 and rotate any secrets on hosts that installed it.

Data as of 6 Aug 2026, 18:36 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-13417

What to do

Remove @ccfly/setup-linux-arm64 from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
npm@ccfly/setup-linux-arm64	Affected =0.1.0	Fixed in–

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Description

The npm package @ccfly/setup-linux-arm64 version 0.1.0 contains a malicious 6.3 MB Go binary targeting Linux ARM64 systems. This binary establishes a persistent remote-access channel by connecting to hardcoded remote endpoints and spawning a local pseudo-terminal (PTY), allowing remote operators interactive shell access on the infected host. The package is designed as an optional dependency and is not auto-executed on install, but a parent @ccfly/* wrapper package may invoke it to activate the backdoor. No official patch or remediation guidance is currently available.

Impact

If executed, this package grants remote attackers persistent interactive shell access on the affected Linux ARM64 host, enabling full control over the system. This can lead to unauthorized data access, system manipulation, and further compromise. The package itself is not auto-executed on install, reducing risk unless invoked by a parent package or manually executed. No known exploits in the wild have been reported yet.

Defensive guidance

Users should avoid installing or executing the @ccfly/setup-linux-arm64 package and any parent @ccfly/* packages that may invoke it. Audit dependency trees for this package and remove it if found. Monitor for any updates from the package maintainers or npm advisories for remediation. Since the package is not auto-executed on install, preventing execution of the binary mitigates the threat.

Summary

The @ccfly/setup-linux-arm64 npm package (version 0.1.0) includes a large Go binary that embeds PTY spawning and WebSocket libraries. It connects to hardcoded remote servers (e.g., ccflycc.hn) over WebSocket and bridges this connection to a locally spawned PTY, effectively providing remote interactive shell access to the attacker. The binary contains strings indicating client installation and pairing, suggesting a persistent remote-access trojan functionality. The package is platform-optional and not automatically executed on npm install, implying it is intended to be triggered by a parent package that uses it as an optional dependency. This behavior constitutes a malicious package designed to compromise Linux ARM64 systems where it is installed and executed.

References

npmjs.com/package/@ccfly/setup-linux-arm64/v/0.1.0 (opens in a new tab)

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What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Aug 2026, 18:36 UTC

Technical details

References

Community reviews