What is CVE-2026-55199?

CVE-2026-55199 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. libssh2 - Pre-Authentication DoS via SSH_MSG_EXT_INFO Handler

Which CVE IDs does CVE-2026-55199 cover?

CVE-2026-55199 covers the following CVE IDs: CVE-2026-55199. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-55199?

CVE-2026-55199 has a CVSS v3 base score of 5.9, published by Microsoft Security Response Center (MSRC).

CVE-2026-55199HighCVSS 5.9

libssh2 - Pre-Authentication DoS via SSH_MSG_EXT_INFO Handler

Vendor

Microsoft Security Response Center (MSRC)

Published

June 30, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-55199 →