CVE-2026-104827
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
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 status line and partial header, withhold the \r\n\r\n or \n\n terminator, and continue streaming data so the buffer grows for the life of the connection.
Risk Assessment
Applications fetching attacker-controlled URLs can exhaust PHP memory_limit and crash the event loop or worker process, causing denial of service.
Recommendation
Upgrade react/http to version 1.11.1 or later.
Other vulnerabilities in react/http
Original NVD description (English source)
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 status line and partial header, withhold the \r\n\r\n or \n\n header terminator, and continue streaming data so the buffer grows for the life of the connection. Applications that fetch attacker-controlled or attacker-influenced URLs, including URLs reached through redirects, can exhaust PHP memory_limit and crash the event-loop or worker process. Confidentiality and integrity are unaffected. This issue is fixed in version 1.11.1.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS