Public PoC Released for Critical libssh2 CVE-2026-55200 Client-Side SSH Flaw
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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.
1Key Takeaways
- 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.
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. The Hacker News reports that 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.
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