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CVE-2026-62878

Microsoft Windows 10 1607 buffer overflow

9.8 CRITICALEPSS 0.97%
  1. Published11 Aug 2026

Description

Stack-based buffer overflow in Windows DNS 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 10 1607< 10.0.14393.9418
Microsoft Windows 10 1809< 10.0.17763.9121
Microsoft Windows Server 2012r2
Microsoft Windows Server 2016< 10.0.14393.9418
Microsoft Windows Server 2019< 10.0.17763.9121
Microsoft Windows Server 2022< 10.0.20348.5440
Microsoft Windows Server 2025< 10.0.26100.33222

Remediation

Fixed in
Microsoft Windows 10 1607≥ 10.0.14393.9418
Microsoft Windows 10 1809≥ 10.0.17763.9121
Microsoft Windows Server 2016≥ 10.0.14393.9418
Microsoft Windows Server 2019≥ 10.0.17763.9121
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-2026-62878 being actively exploited?

CVE-2026-62878 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.97%.

How severe is CVE-2026-62878?

CVE-2026-62878 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-2026-62878?

Affected products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, and 2 more.

How do I fix CVE-2026-62878?

Upgrade affected software to a fixed version, for example Microsoft Windows 10 1607 10.0.14393.9418, Microsoft Windows 10 1809 10.0.17763.9121, Microsoft Windows Server 2016 10.0.14393.9418 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-62878 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.