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CVE-2026-42990

Microsoft Windows 10 21h2 buffer overflow

9.8 CRITICALEPSS 0.97%
  1. Published14 Jul 2026

Description

Heap-based buffer overflow in SQL Server ODBC driver 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< 10.0.14393.9339
Microsoft Windows 10 1809< 10.0.17763.9020
Microsoft Windows 10 21h2< 10.0.19044.7548
Microsoft Windows 10 22h2< 10.0.19045.7548
Microsoft Windows 11 24h2< 10.0.26100.8875
Microsoft Windows 11 25h2< 10.0.26200.8875
Microsoft Windows 11 26h1< 10.0.28000.2269
Microsoft Windows Server 2012r2
Microsoft Windows Server 2016< 10.0.14393.9339
Microsoft Windows Server 2019< 10.0.17763.9020
Microsoft Windows Server 2022< 10.0.20348.5386
Microsoft Windows Server 2025< 10.0.26100.33158

Remediation

Fixed in
Microsoft Windows 10 1607≥ 10.0.14393.9339
Microsoft Windows 10 1809≥ 10.0.17763.9020
Microsoft Windows 10 21h2≥ 10.0.19044.7548
Microsoft Windows 10 22h2≥ 10.0.19045.7548
Microsoft Windows 11 24h2≥ 10.0.26100.8875
Microsoft Windows 11 25h2≥ 10.0.26200.8875
Microsoft Windows 11 26h1≥ 10.0.28000.2269
Microsoft Windows Server 2016≥ 10.0.14393.9339
Microsoft Windows Server 2019≥ 10.0.17763.9020
Microsoft Windows Server 2022≥ 10.0.20348.5386

References

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Frequently asked

Is CVE-2026-42990 being actively exploited?

CVE-2026-42990 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.97%.

How severe is CVE-2026-42990?

CVE-2026-42990 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-2026-42990?

Affected products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 24h2, and 7 more.

How do I fix CVE-2026-42990?

Upgrade affected software to a fixed version, for example Microsoft Windows 10 1607 10.0.14393.9339, Microsoft Windows 10 1809 10.0.17763.9020, Microsoft Windows 10 21h2 10.0.19044.7548 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-42990 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.