What is CVE-2026-56865?

CVE-2026-56865 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog

Which CVE IDs does CVE-2026-56865 cover?

CVE-2026-56865 covers the following CVE IDs: CVE-2026-56865. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-56865?

CVE-2026-56865 has a CVSS v3 base score of 8.4, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-56865?

CVE-2026-56865 affects 4 products, including: azl3 golang 1.25.12-1 on Azure Linux 3.0; azl3 golang 1.26.5-2 on Azure Linux 3.0; azl3 golang 1.26.7-1 on Azure Linux 3.0; azl3 golang 1.27.0-1 on Azure Linux 3.0.

CVE-2026-56865HighCVSS 8.4

Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog

Vendor

Microsoft Security Response Center (MSRC)

Published

August 20, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-56865 →

🎯 Affected products4

azl3 golang 1.25.12-1 on Azure Linux 3.0
azl3 golang 1.26.5-2 on Azure Linux 3.0
azl3 golang 1.26.7-1 on Azure Linux 3.0
azl3 golang 1.27.0-1 on Azure Linux 3.0

✅ Remediation

Security Update KBRelease Notes (Security Update) — fixed build 1.26.6-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56865
patchhttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade