A public proof-of-concept is now out for CVE-2026-55200, a critical flaw in libssh2 that lets a malicious or compromised SSH server trigger memory corruption on a connecting client, with possible code execution. No credentials, no user interaction. The bug affects every release up to and including 1.11.1 and carries a CVSS 4.0 score of 9.2.

libssh2 is a client-side SSH library, not a server.



Source: TheHackerNews
Source Link: https://thehackernews.com/2026/06/public-poc-released-for-critical.html