cobrowsing-cobrowsing-core (npm) · Malicious Code
Affects cobrowsing-cobrowsing-coreSource GCVE Database
Malicious package : remove cobrowsing-cobrowsing-core and rotate any secrets on hosts that installed it.
Data as of 5 Aug 2026, 16:19 UTC
Malicious package
Published to npm · OSV MAL-2026-12651
What to do
Remove cobrowsing-cobrowsing-core 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 |
|---|---|---|
| npmcobrowsing-cobrowsing-core | 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 cobrowsing-cobrowsing-core version 35.5.8 is a malicious package acting as a binary dropper disguised as a platform core package. Upon being imported or required, it downloads attacker-controlled payloads specific to the host platform from Cloudflare Workers domains, writes them to temporary directories, sets executable permissions, and executes them without any signature or hash verification. It also includes a fallback covert delivery mechanism via DNS TXT records. This behavior results in arbitrary code execution on the host system when the package is installed and loaded.