OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms.

🔗 CVE IDs covered (1)

🎯 Affected products5

• azl3 openssh 9.8p1-5 on Azure Linux 3.0
• azl3 openssh 9.8p1-6 on Azure Linux 3.0
• azl3 openssh 9.8p1-8 on Azure Linux 3.0
• cbl2 openssh 8.9p1-9 on CBL Mariner 2.0
• cbl2 openssh 8.9p1-9 on CBL-Mariner 2.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 9.8p1-8 KBRelease Notes (Security Update)

🔗 References (2)

• advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35387
• referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade