MalwarePublished 5 Aug 2026

tinkoff-ui-action (npm) · Malicious Code

Affects tinkoff-ui-actionSource GCVE Database

Malicious package : remove tinkoff-ui-action and rotate any secrets on hosts that installed it.

Data as of 6 Aug 2026, 19:21 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-12051

What to do

Remove tinkoff-ui-action 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
npmtinkoff-ui-action	Affected =20.5.7	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

The npm package tinkoff-ui-action version 20.5.7 contains malicious code that downloads and executes platform-specific native binaries from obfuscated Cloudflare Workers subdomains and fallback domains without user consent or verification. This behavior is disguised within a React UI component library, making it unexpected and dangerous. The package writes these binaries to temporary directories, sets executable permissions, and runs them detached from the main process. A secondary payload runner is also present under an 'Analytics SDK' cover, further enabling malicious activity. Systems with this package installed should be considered fully compromised, and all secrets and keys on those systems should be rotated immediately from a separate, clean device.

Impact

Any system with tinkoff-ui-action version 20.5.7 installed or running is considered fully compromised due to the package's capability to download and execute arbitrary native code without user consent or verification. This can lead to complete loss of confidentiality, integrity, and availability of the affected system. All secrets, credentials, and keys stored on the compromised system should be assumed exposed and must be rotated immediately from a secure environment. Removal of the package alone does not guarantee eradication of all malicious artifacts or persistence mechanisms.

Defensive guidance

Remove the tinkoff-ui-action package version 20.5.7 immediately from all affected systems. Rotate all secrets, keys, and credentials that were stored or used on compromised systems from a separate, trusted device. Conduct a thorough investigation and remediation of the affected systems, as full compromise is likely. There is no known patch or fixed version available; therefore, avoid using this package until a trustworthy update is released. Monitor for any suspicious activity related to this package or its downloaded payloads.

Summary

The tinkoff-ui-action npm package version 20.5.7 includes malicious functionality that, upon requiring its main entry, downloads platform-specific executable binaries from dynamically constructed Cloudflare Workers subdomains and fallback domains using runtime string assembly to evade static detection. These binaries are saved to temporary locations with obfuscated filenames, permissioned for execution, and launched in a detached manner. Additionally, the package contains a secondary payload runner in lib/telemetry.js that uses obfuscated Node.js APIs to perform similar download and execution steps under the guise of an 'Analytics SDK'. There is no integrity verification or user consent involved. This behavior effectively grants remote code execution capabilities and full system compromise to an attacker controlling the downloaded payloads.

References

Community reviews

Loading reviews…

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Aug 2026, 19:21 UTC

Technical details

References

Community reviews