CVE-2026-104827: CWE-770: Allocation of Resources Without Limits or Throttling in reactphp http
Description
A resource allocation vulnerability exists in reactphp http versions from 1.0.0 up to but not including 1.11.1. The ClientRequestStream::handleData() method appends response-header bytes to an internal buffer without size limits, allowing a remote server to cause unbounded memory growth by sending partial headers without termination. This can exhaust PHP memory and crash the event loop or worker process. The issue is fixed in version 1.11.1. Confidentiality and integrity are not impacted.
CVSS v3.1
Score 7.5high
Affected software
reactphp
http
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
In reactphp http versions >=1.0.0 and <1.11.1, the ClientRequestStream::handleData() function appends response-header bytes to an internal buffer without enforcing a size limit. A remote server can exploit this by sending a valid status line and partial header but withholding the header terminator sequence (\r\n\r\n or \n\n), causing the buffer to grow indefinitely for the duration of the connection. This can lead to exhaustion of PHP's memory_limit, crashing the event loop or worker process. The vulnerability is classified under CWE-770 (Allocation of Resources Without Limits or Throttling). The issue is resolved in reactphp http version 1.11.1.
Potential Impact
The vulnerability allows a remote server to cause unbounded memory consumption on clients using affected reactphp http versions by sending incomplete HTTP headers that never terminate. This can exhaust PHP memory limits and crash the event loop or worker process, resulting in denial of service. There is no impact on confidentiality or integrity of data.
Mitigation Recommendations
Upgrade reactphp http to version 1.11.1 or later, where this issue is fixed. No other mitigations are indicated. Patch status is confirmed fixed in 1.11.1.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-02T14:17:09.335Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad11caa2cdf04f6565042b4
Added to database: 10/15/2026, 18:34:18 UTC
Last enriched: 10/15/2026, 18:48:24 UTC
Last updated: 10/15/2026, 19:28:23 UTC
Views: 10
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