Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- 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
FAQ
What is CVE-2026-84997?
CVE-2026-84997 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 malfo...
How severe is CVE-2026-84997?
CVE-2026-84997 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-84997?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.