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CVE-2026-62815

Microsoft Windows 11 23h2 use-after-free

9.8 CRITICALEPSS 0.97%
  1. Published11 Aug 2026

Description

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Windows 11 23h2< 10.0.22631.7517
Microsoft Windows 11 24h2< 10.0.26100.9106
Microsoft Windows 11 25h2< 10.0.26200.9106
Microsoft Windows 11 26h1< 10.0.28000.2704
Microsoft Windows Server 2022< 10.0.20348.5440
Microsoft Windows Server 2025< 10.0.26100.33222

Remediation

Fixed in
Microsoft Windows 11 23h2≥ 10.0.22631.7517
Microsoft Windows 11 24h2≥ 10.0.26100.9106
Microsoft Windows 11 25h2≥ 10.0.26200.9106
Microsoft Windows 11 26h1≥ 10.0.28000.2704
Microsoft Windows Server 2022≥ 10.0.20348.5440
Microsoft Windows Server 2025≥ 10.0.26100.33222

References

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Frequently asked

Is CVE-2026-62815 being actively exploited?

CVE-2026-62815 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.97%.

How severe is CVE-2026-62815?

CVE-2026-62815 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.97% probability of exploitation.

Which products are affected by CVE-2026-62815?

Affected products include Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows Server 2022, and 1 more.

How do I fix CVE-2026-62815?

Upgrade affected software to a fixed version, for example Microsoft Windows 11 23h2 10.0.22631.7517, Microsoft Windows 11 24h2 10.0.26100.9106, Microsoft Windows 11 25h2 10.0.26200.9106 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-62815 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.