AIKIDO-2026-375681
react/http is vulnerable to Denial of Service (DoS)
75
High Risk
This Affects:
react/httpTL;DR
The HTTP client buffers response bytes in ClientRequestStream::handleData() until it finds the end of the header block, with no ceiling on the buffered size. A remote server can withhold the terminating double CRLF while continuously streaming data, so the client keeps allocating memory until PHP's memory limit is hit and the process crashes. Exposure is unauthenticated and network reachable for any request to an untrusted or attacker-influenced server, including via redirects. The fix caps the response header block at 65536 bytes and raises an OverflowException when the limit is exceeded.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you use the HTTP client (for example React\Http\Browser) to send requests to untrusted or externally influenced servers.
Background info
react/http is vulnerable to Denial of Service (DoS) in versions 1.0.0 - 1.11.0.
How to fix this
Upgrade the react/http library to the patch version.
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