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Technical advisory

USN-8799-1: libssh2 vulnerabilities

Official source
EudorIA operational summary

What it means

Priority 70/100

Ubuntu ha rilasciato un avviso di sicurezza (USN-8799-1) relativo a vulnerabilità in libssh2. Le vulnerabilità consentono a un attaccante remoto di causare un denial of service o eseguire codice arbitrario tramite un server SSH malizioso. Le patch sono disponibili per diverse versioni di libssh2, ma richiedono l'aggiornamento del sistema.

Why it matters

Le vulnerabilità in libssh2 possono compromettere la sicurezza delle comunicazioni SSH e SFTP, mettendo a rischio i dati sensibili e la disponibilità dei servizi. Per le PMI italiane, un attacco potrebbe portare a interruzioni operative e perdite di dati.

Potential operational benefits

  • Riduzione della superficie esposta a vulnerabilità in libssh2
  • Miglioramento della sicurezza delle comunicazioni SSH e SFTP
  • Aumento della resilienza contro attacchi di tipo denial of service
Indications to confirm against the customer's technical and organisational perimeter.
Relevant controlsPatch managementFirewall NGFW / IPSMonitoraggio / SIEMSegmentazione di rete
AudienceITSOC
Information centre

Translation in progress

Ubuntu Security

The official content is available in the original language. The Italian version will be published once automated checks are complete.

Text acquired from the source

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)

Source
Ubuntu Security Notices
Publishing entity
Ubuntu Security
Entity type
vendor security
Area
Global
Original language
en · translation in preparation
Publication
22/09/2026 05:58
MITRE ATT&CK
T1190, T1486
CVE
CVE-2026-58050, CVE-2026-58051, CVE-2026-66032, CVE-2026-66034
Technical scope

Affected products and versions

Verification in progress
Information not yet acquired.

The collector will check NVD and the available official vendor advisories.

Open the original source