What is CVE-2026-66033?

CVE-2026-66033 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. libssh2 Integer Underflow DoS via AES-GCM Cipher Negotiation

Which CVE IDs does CVE-2026-66033 cover?

CVE-2026-66033 covers the following CVE IDs: CVE-2026-66033. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-66033?

CVE-2026-66033 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-66033?

CVE-2026-66033 affects 3 products, including: azl3 libssh2 1.11.1-4 on Azure Linux 3.0; azl3 rust 1.75.0-30 on Azure Linux 3.0; azl3 rust 1.96.1-1 on Azure Linux 3.0.

CVE-2026-66033HighCVSS 7.5

libssh2 Integer Underflow DoS via AES-GCM Cipher Negotiation

Vendor

Microsoft Security Response Center (MSRC)

Published

July 27, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-66033 →

🎯 Affected products3

azl3 libssh2 1.11.1-4 on Azure Linux 3.0
azl3 rust 1.75.0-30 on Azure Linux 3.0
azl3 rust 1.96.1-1 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 1.11.1-5 Security Update — fixed build 1.96.1-2

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66033
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade