tcb-web-copy-to-clipboard (npm) · Malicious Code
Affects tcb-web-copy-to-clipboardSource GCVE Database
Malicious package : remove tcb-web-copy-to-clipboard and rotate any secrets on hosts that installed it.
Data as of 26 Oct 2026, 16:15 UTC
Malicious package
Published to npm · OSV MAL-2026-12475
What to do
Remove tcb-web-copy-to-clipboard 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 |
|---|---|---|
| npmtcb-web-copy-to-clipboard | Affected
| 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 tcb-web-copy-to-clipboard version 20.1.2 contains malicious code that fetches and executes an attacker-controlled binary at runtime. The package masquerades as a clipboard SDK but downloads an unverified executable from dynamically assembled Cloudflare Workers hosts, saves it under a disguised name in temporary directories, sets executable permissions, and runs it detached. This behavior is hidden behind obfuscated domain assembly and a false telemetry opt-out mechanism. The fetched executable is unrelated to clipboard functionality and poses a security risk.