Severity: HighAction: Be aware

Malicious Claude Code Extension Served in Cursor Supply Chain Attack

The extension performed host reconnaissance and attempted to create a reverse SSH tunnel.

Excerpt from the primary source: SecurityWeek

Who is affected

Small businesses · Enterprises · Developers

Affected technology: Claude

What you should do · Be aware

No immediate action is indicated. Share this with the relevant teams and watch for updates.

Automated guidance based on this story's classification. Check the linked advisories for specifics.

Sources

We link to original and authoritative sources. Headlines and excerpts belong to their publishers.

Original reporting

Malicious Claude Code Extension Served in Cursor Supply Chain Attack SecurityWeek · securityweek.com · Nov 2, 2026 · Primary source
Severity: ElevatedAction: Be aware

Critical Linux kernel flaw allows remote root attacks on MPTCP servers

Security researchers at Anthropic have developed an exploit for a critical Linux kernel vulnerability that allows unauthenticated attackers to remotely execute commands as root on servers running Multipath TCP (MPTCP) listeners.