What is CVE-2026-91768?

CVE-2026-91768 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. IPv6 ACL bypass in FastCGI listen.allowed_clients due to partial address comparison (memcmp 12 bytes)

Which CVE IDs does CVE-2026-91768 cover?

CVE-2026-91768 covers the following CVE IDs: CVE-2026-91768. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-91768?

CVE-2026-91768 has a CVSS v3 base score of 6.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-91768?

CVE-2026-91768 affects 1 product, including: azl3 php 8.3.33-1 on Azure Linux 3.0.

CVE-2026-91768MediumCVSS 6.5

IPv6 ACL bypass in FastCGI listen.allowed_clients due to partial address comparison (memcmp 12 bytes)

Vendor

Microsoft Security Response Center (MSRC)

Published

September 27, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-91768 →

🎯 Affected products1

azl3 php 8.3.33-1 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-91768
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade