Bottom line: Exploit for critical libssh2 vulnerability in active use — update still pending.
A functional exploit for a critical vulnerability in libssh2 is being actively exploited. The flaw enables remote code execution through malicious SSH servers and affects numerous widespread applications such as curl and PHP.
The libssh2 library contains a critical security vulnerability for which a functional exploit is circulating in the wild. Through malicious SSH servers, attackers can execute arbitrary code on affected systems. The vulnerability affects numerous widespread applications that use libssh2 — including curl and PHP.
For CISOs, this means that comprehensive inventory management and risk assessment become a priority. Which systems in the infrastructure use libssh2, and are they exposed to potential malicious SSH servers? Special attention should be paid to development environments, automated processes and CI/CD pipelines that initiate SSH connections.
At the present time, an official security update for libssh2 is still pending. This increases the urgency of taking preventive measures: network segmentation, restriction of SSH connections to trusted servers, monitoring for suspicious SSH activity and planning patch cycles for when a fix becomes available are suitable countermeasures.
Source: www.security-insider.de · Published 8 July 2026
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