CVE-2026-84997 — react/http: A malformed HTTP chunked body can lead to a denial-of-service and peg the CPU

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
reactphp / http	affected >= 0.6.0, < 1.11.1

CWE

CWE-835

References

ADP enrichment

CISA-ADP

No English description supplied.

https://github.com/reactphp/http/security/advisories/GHSA-x424-64qh-5j54