What is CVE-2026-27138?

CVE-2026-27138 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Panic in name constraint checking for malformed certificates in crypto/x509

Which CVE IDs does CVE-2026-27138 cover?

CVE-2026-27138 covers the following CVE IDs: CVE-2026-27138. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-27138?

CVE-2026-27138 has a CVSS v3 base score of 5.9, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-27138?

CVE-2026-27138 affects 2 products, including: azl3 golang 1.25.7-1 on Azure Linux 3.0; azl3 golang 1.26.0-1 on Azure Linux 3.0.

CVE-2026-27138MediumCVSS 5.9

Panic in name constraint checking for malformed certificates in crypto/x509

Vendor

Microsoft Security Response Center (MSRC)

Published

May 31, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-27138 →

🎯 Affected products2

azl3 golang 1.25.7-1 on Azure Linux 3.0
azl3 golang 1.26.0-1 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 1.25.8-1 KBCBL-Mariner Releases (Security Update) — fixed build 1.26.1-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27138
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade