What is CVE-2026-66034?

CVE-2026-66034 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. libssh2 Heap Out-of-Bounds Read via publickey subsystem

Which CVE IDs does CVE-2026-66034 cover?

CVE-2026-66034 covers the following CVE IDs: CVE-2026-66034. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-66034?

CVE-2026-66034 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-66034?

CVE-2026-66034 affects 2 products, including: azl3 libssh2 1.11.1-4 on Azure Linux 3.0; azl3 rust 1.75.0-30 on Azure Linux 3.0.

CVE-2026-66034HighCVSS 7.5

libssh2 Heap Out-of-Bounds Read via publickey subsystem

Vendor

Microsoft Security Response Center (MSRC)

Published

July 27, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-66034 →

🎯 Affected products2

azl3 libssh2 1.11.1-4 on Azure Linux 3.0
azl3 rust 1.75.0-30 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 1.11.1-5

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66034
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade