GCVE-110-NCSC-2026-210

Advisory PublishedCVSS 5.9/10

Vulnetix · Advisory published June 23, 2026

libssh2 versions through 1.11.1 contain a pre-authentication denial of service vulnerability in the SSH_MSG_EXT_INFO handler that allows a malicious SSH server to cause client CPU exhaustion via a crafted extension count, fixed in commit 1762685.

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Weaknesses (CWE)

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')

Risk Scores

CVSS 3.1

5.9/10

Medium · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions	Platforms
libssh2	vers:unknown/*	—	—
Open Source	vers:unknown/*	—	—

Aliases

CVE-2026-55199 CVE-2026-55200

References

advisory

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