Severity: ElevatedAction: Be aware

CISA warns of hackers now exploiting critical Node2Shell flaw

On Tuesday, the US Cybersecurity and Infrastructure Security Agency (CISA) confirmed that hackers have begun exploiting a critical Brotli vulnerability known as Node2Shell, Broccoli2Shell, and HTTP2Shell.

Excerpt from the primary source: BleepingComputer

Who is affected

Security professionals

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

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Original reporting

CISA warns of hackers now exploiting critical Node2Shell flaw BleepingComputer · bleepingcomputer.com · Oct 28, 2026 · Primary source