What is CVE-2026-56857?

CVE-2026-56857 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. Root.Mkdir(All) can follow junctions out of the root on Windows in os

Which CVE IDs does CVE-2026-56857 cover?

CVE-2026-56857 covers the following CVE IDs: CVE-2026-56857. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-56857?

CVE-2026-56857 has a CVSS v3 base score of 9.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-56857?

CVE-2026-56857 affects 2 products, including: azl3 golang 1.26.7-1 on Azure Linux 3.0; azl3 golang 1.27.1-1 on Azure Linux 3.0.

CVE-2026-56857CriticalCVSS 9.8

Root.Mkdir(All) can follow junctions out of the root on Windows in os

Vendor

Microsoft Security Response Center (MSRC)

Published

October 11, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-56857 →

🎯 Affected products2

azl3 golang 1.26.7-1 on Azure Linux 3.0
azl3 golang 1.27.1-1 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56857
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade