What is CVE-2026-116566?

CVE-2026-116566 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. socket.getaddrinfo() accepts embedded null bytes in host and port

Which CVE IDs does CVE-2026-116566 cover?

CVE-2026-116566 covers the following CVE IDs: CVE-2026-116566. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by CVE-2026-116566?

CVE-2026-116566 affects 3 products, including: azl3 python-py 1.11.0-1 on Azure Linux 3.0; azl3 python3 3.12.14-2 on Azure Linux 3.0; azl3 python3 3.12.16-1 on Azure Linux 3.0.

CVE-2026-116566Medium

socket.getaddrinfo() accepts embedded null bytes in host and port

Vendor

Microsoft Security Response Center (MSRC)

Published

October 31, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-116566 →

🎯 Affected products3

azl3 python-py 1.11.0-1 on Azure Linux 3.0
azl3 python3 3.12.14-2 on Azure Linux 3.0
azl3 python3 3.12.16-1 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-116566
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade