What is CVE-2026-42772?

CVE-2026-42772 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Potential CPU DoS via O(n^2) Fragment Reassembly in QUIC

Which CVE IDs does CVE-2026-42772 cover?

CVE-2026-42772 covers the following CVE IDs: CVE-2026-42772. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-42772?

CVE-2026-42772 has a CVSS v3 base score of 5.3, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-42772?

CVE-2026-42772 affects 6 products, including: azl3 cloud-hypervisor 52.0.152-1 on Azure Linux 3.0; azl3 kata-containers 4.1.0.kata0-1 on Azure Linux 3.0; azl3 openssl 3.3.7-6 on Azure Linux 3.0; azl3 openvmm 0.1.0-1 on Azure Linux 3.0; azl3 rust 1.75.0-31 on Azure Linux 3.0; and others — see the full list on the advisory page.

CVE-2026-42772MediumCVSS 5.3

Potential CPU DoS via O(n^2) Fragment Reassembly in QUIC

Vendor

Microsoft Security Response Center (MSRC)

Published

October 3, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-42772 →

🎯 Affected products6

azl3 cloud-hypervisor 52.0.152-1 on Azure Linux 3.0
azl3 kata-containers 4.1.0.kata0-1 on Azure Linux 3.0
azl3 openssl 3.3.7-6 on Azure Linux 3.0
azl3 openvmm 0.1.0-1 on Azure Linux 3.0
azl3 rust 1.75.0-31 on Azure Linux 3.0
azl3 rust 1.96.1-2 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42772
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade