What is CVE-2026-27459?

CVE-2026-27459 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. pyOpenSSL DTLS cookie callback buffer overflow

Which CVE IDs does CVE-2026-27459 cover?

CVE-2026-27459 covers the following CVE IDs: CVE-2026-27459. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by CVE-2026-27459?

CVE-2026-27459 affects 2 products, including: azl3 pyOpenSSL 24.2.1-1 on Azure Linux 3.0; cbl2 pyOpenSSL 18.0.0-8 on CBL Mariner 2.0.

CVE-2026-27459High

pyOpenSSL DTLS cookie callback buffer overflow

Vendor

Microsoft Security Response Center (MSRC)

Published

May 31, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-27459 →

🎯 Affected products2

azl3 pyOpenSSL 24.2.1-1 on Azure Linux 3.0
cbl2 pyOpenSSL 18.0.0-8 on CBL Mariner 2.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 24.2.1-2

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27459
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade