Ghostwire

CVE-2026-53965: MCP PHP SDK: client HttpTransport SSE buffer (sseBuffer .= chunk) grows unbounded when server withholds the event...

HIGH CVSS 0.0 Exploit Available

Published: August 19, 2026 | Last Modified: August 19, 2026

Description

MCP PHP SDK: client HttpTransport SSE buffer (sseBuffer .= chunk) grows unbounded when server withholds the event delimiter

Ghostwire Analysis — What This Means Practically

Exploit code is reported to be available, increasing the likelihood of active exploitation.

This analysis is generated by Ghostwire from NVD, CISA KEV, EPSS, and open-source intelligence data. Verify findings through primary sources before acting.

References

github.com/modelcontextprotocol/php-sdk/security/advisories/GHSA-7m52-jw36-44r3
github.com/FriendsOfPHP/security-advisories/blob/master/mcp/sdk/CVE-2026-53965.y
github.com/modelcontextprotocol/php-sdk/releases/tag/v0.7.1
github.com/advisories/GHSA-7m52-jw36-44r3
www.tenable.com/cve/CVE-2026-53965
www.cnnvd.org.cn/home/globalSearch?keyword=CVE-2026-53965