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Microsoft Security Response CenterCVE-2026-63073

Untrusted Sender DN Used as Format String in CMP Response Validation

Mariner

Read the vendor bulletin Get alerts for azl3 kata-containers 3.32.0.kata0-2 on Azure Linux
9.8CVSS out of 10Critical severity
Scope

What the vendor says is affected

  • azl3 kata-containers 3.32.0.kata0-2 on Azure Linux 3.0
  • azl3 rust 1.75.0-30 on Azure Linux 3.0
  • azl3 cloud-hypervisor 51.1.101-2 on Azure Linux 3.0
  • azl3 openssl 3.3.7-4 on Azure Linux 3.0
  • azl3 rust 1.90.0-10 on Azure Linux 3.0
  • azl3 openvmm 0.1.0-1 on Azure Linux 3.0
Next step

What the vendor recommends

See the Microsoft Security Update Guide for the update that applies to your product.

Review the complete instructions on the vendor's site
Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

    • Severity changed from Medium to Critical.
    • CVSS changed from 7.4 to 9.8.
    • Added affected products: azl3 openvmm 0.1.0-1 on Azure Linux 3.0.
    • The vendor changed its remediation guidance.
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-63073View CVSS, KEV, EPSS, and threat context
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