Cve 2026 111497
In short
CVE-2026-111497, also known as HTTP2Shell or Node2Shell, is a critical remote code execution vulnerability caused by a flaw in the Brotli compression decoder. It allows attackers to take control of servers and various connected devices.
In plain words
A mistake in how certain software handles compressed data allows hackers to run their own commands on a computer. While it was first found in Node.js, the problem actually affects many different programming tools and systems.
A simple example
An attacker sends a specially crafted piece of compressed data to a web server. When the server tries to unpack this data using the Brotli decoder, it accidentally executes the attacker's hidden code.
Why it matters
The flaw is dangerous because it affects more than just web servers; it can hit home appliances and many different software languages. Because proof-of-concept exploits already exist, users must update their software immediately to prevent attacks.
Easy to mix up
Do not confuse this with PHP2Shell, which is a separate vulnerability that only affects PHP web servers.
Sources
- What is HTTP2Shell? A Beginner's Guide to the Critical Node.js Vulnerability
- Security vulnerability found in Node.js after PHP; urgent update recommended
- HTTP2Shell Vulnerability Extends Beyond HTTP, Affecting .NET, FFmpeg, ClickHouse, and Apache Arrow
- New Node2Shell RCE vulnerability could hit servers, home appliances, and more