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Ubuntu Security NoticesUSN-8799-1

USN-8799-1: libssh2 vulnerabilities

It was discovered that libssh2 incorrectly handled certain publickey subsystem attributes. A remote attacker controlling a malicious SSH server could use this issue to cause a denial of service or possibly execute arbitrary code. (CVE-2026-58050) It was discovered that libssh2 did not properly initialize publickey list entries before parsing. A remote attacker controlling a malicious SSH server could use this issue to cause a denial of service or possibly execute arbitrary code. (CVE-2026-58051) It was discovered that libssh2 incorrectly handled certain SFTP server responses. A remote attacker controlling an SSH server could use this issue to cause libssh2 to crash or possibly execute arbitrary code. (CVE-2026-66032) It was discovered that libssh2 did not properly check bounds in certain publickey subsystem responses. A remote attacker controlling a malicious SSH server could use this issue to cause a denial of service or possibly execute arbitrary code.. (CVE-2026-66034)

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Scope

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  1. Published by Ubuntu

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  2. Added to SecurityAlert

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  3. Confirmed at the source

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Vulnerabilities

CVEs named in this advisory

CVE-2026-58050View CVSS, KEV, EPSS, and threat contextCVE-2026-58051View CVSS, KEV, EPSS, and threat contextCVE-2026-66032View CVSS, KEV, EPSS, and threat contextCVE-2026-66034View CVSS, KEV, EPSS, and threat context
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