A vulnerability in Node.js HTTP servers allows an attacker to send a specially crafted HTTP request with chunked encoding leading to resource exhaustion and denial of service (DoS). The server reads an unbounded number of bytes from a single connection exploiting the lack of limitations on chunk extension bytes. The issue can cause CPU and network bandwidth exhaustion bypassing standard safeguards like timeouts and body size limits.

Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability? One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.