react/http: Unbounded HTTP Client Response Header Buffering Leads to Memory Exhaustion DoS

Summary React\Http\Browser and its lower-level HTTP stack impose no limit on the size of a response's header section while it is being received. ClientRequestStream::handleData appends every incoming byte to an internal buffer and only scans that buffer for the \r\n\r\n or \n\n terminator, withou...

EUVD-2026-102255

react/http is an event-driven, streaming HTTP client and server implementation for ReactPHP. From 1.0.0 until 1.11.1, React\Http\Browser uses ClientRequestStream::handleData to append response-header bytes to an internal buffer without enforcing a size limit. A remote server can send a valid stat...

CVE-2026-104827

The react/http library (an event-driven HTTP client and server for ReactPHP ) is vulnerable to a memory exhaustion Denial of Service (DoS) in versions 1.0.0 through 1.11.1 . The root cause lies in React\Http\Browser 's ClientRequestStream::handleData() function, which appends response-header byte...