What is CVE-2026-42505?

CVE-2026-42505 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Invoking Encrypted Client Hello privacy leak in crypto/tls

Which CVE IDs does CVE-2026-42505 cover?

CVE-2026-42505 covers the following CVE IDs: CVE-2026-42505. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-42505?

CVE-2026-42505 has a CVSS v3 base score of 5.3, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-42505?

CVE-2026-42505 affects 2 products, including: azl3 golang 1.25.11-3 on Azure Linux 3.0; azl3 golang 1.26.4-3 on Azure Linux 3.0.

CVE-2026-42505MediumCVSS 5.3

Invoking Encrypted Client Hello privacy leak in crypto/tls

Vendor

Microsoft Security Response Center (MSRC)

Published

July 17, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-42505 →

🎯 Affected products2

azl3 golang 1.25.11-3 on Azure Linux 3.0
azl3 golang 1.26.4-3 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 1.26.5-2

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42505
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade