CVE-2026-84997

react/http is an event-driven, streaming HTTP client and server implementation for ReactPHP. From 0.6.0 until 1.11.1, React\Http\Io\ChunkedDecoder could enter an infinite loop while processing a malformed Transfer-Encoding: chunked body because handleData required its buffer to shrink on every iteration. An incomplete terminal-chunk trailer without CRLF left the buffer unchanged after strpos returned false, and exactly two non-CRLF bytes after a completed non-terminal chunk bypassed both the error and wait guards. The affected decoder processes request bodies for React\Http\HttpServer and response bodies for React\Http\Browser, allowing a malicious client to freeze a server or a malicious or compromised server to freeze a client. A reverse proxy that normalizes inbound requests may protect the server direction but does not protect outbound Browser requests. This issue is fixed in version 1.11.1.

• CWE-835

• https://github.com/reactphp/http/commit/b6d4688790adf3797071fcf88a3fc4225f30486a
• https://github.com/reactphp/http/releases/tag/v1.11.1
• https://github.com/reactphp/http/security/advisories/GHSA-x424-64qh-5j54
• https://github.com/reactphp/http/security/advisories/GHSA-x424-64qh-5j54

Published

Sep 16, 2026

Last Modified

Sep 16, 2026

Status

Received

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