HIGH 7.5 Microsoft
CVE-2026-66033
libssh2 Integer Underflow DoS via AES-GCM Cipher Negotiation
Microsoft Security Update 2026-Jul: libssh2 Integer Underflow DoS via AES-GCM Cipher Negotiation
Affected Products
- azl3 libssh 0.10.6-8 on Azure Linux 3.0
- azl3 libssh2 1.11.1-4 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66033
- https://nvd.nist.gov/vuln/detail/CVE-2026-66033
This high severity vulnerability with a CVSS score of 7.5 was published on 2026-07-14 via Microsoft. Affected: azl3 libssh 0.10.6-8 on Azure Linux 3.0, azl3 libssh2 1.11.1-4 on Azure Linux 3.0.
vulnfeed aggregates 9166 vulnerabilities from NVD, CISA KEV,
Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.