SSH Vulnerability

libssh2 CVE-2026-55200: Critical RCE With No Official Patch — What Developers Must Do Now

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libssh2 CVE-2026-55200 vulnerability diagram showing out-of-bounds write in SSH packet length parsing affecting curl and PHP

Introduction On June 23, 2026, researchers disclosed CVE-2026-55200 — a CVSS 9.2 remote code execution vulnerability in libssh2, the SSH library embedded in curl, PHP, Python, Ruby, and hundreds of other applications that handle SSH connections in production software. The vulnerability requires no authentication, no privileges, and no user interaction. An attacker who can cause … Read more