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CVE-2026-34344

HIGHCVSS 7.8/10EPSS 0.31%

Last modified

CVE-2026-34344 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

Description

Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.31%

23.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
MicrosoftWindows 10 1607< 10.0.14393.9140
MicrosoftWindows 10 1809< 10.0.17763.8755
MicrosoftWindows 10 21h2< 10.0.19044.7291
MicrosoftWindows 10 22h2< 10.0.19045.7291
MicrosoftWindows 11 23h2< 10.0.22631.7079
MicrosoftWindows 11 24h2< 10.0.26100.8390
MicrosoftWindows 11 25h2< 10.0.26200.8390
MicrosoftWindows 11 26h1< 10.0.28000.2113
MicrosoftWindows Server 2012All versions
MicrosoftWindows Server 2012r2
MicrosoftWindows Server 2016< 10.0.14393.9140
MicrosoftWindows Server 2019< 10.0.17763.8755
MicrosoftWindows Server 2022< 10.0.20348.5074
MicrosoftWindows Server 2022 23h2< 10.0.25398.2330
MicrosoftWindows Server 2025< 10.0.26100.32772

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-34344?
Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
How severe is CVE-2026-34344?
CVE-2026-34344 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.
How do I fix CVE-2026-34344?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-34344?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST