CVE-2026-34332: Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to execute code over a network.

Q: How do I fix CVE-2026-34332?

windows server 2025: upgrade to 10.0.26100.32772. Exact commands for each OS are on this page.

Q: Is CVE-2026-34332 being exploited?

CVE-2026-34332 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34332 affect?

CVE-2026-34332 affects windows server 2025. Severity is high (CVSS 8.0). Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to execute code over a network.

Q: How urgent is CVE-2026-34332?

Priority 44/100. High severity; On your watchlist

This month

HIGH 8.0WATCHLISTUPGRADE

CVE-2026-34332 is a high-severity flaw (CVSS 8.0) affecting windows server 2025. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to execute code over a network.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.0 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-05-12
Last modified	2026-10-26

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-12 18:17 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

microsoft windows server 2025 UPGRADE

Affected: < 10.0.26100.32772

Fixed in: 10.0.26100.32772

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34332?

windows server 2025: upgrade to 10.0.26100.32772. Exact commands for each OS are on this page.

Is CVE-2026-34332 being exploited?

CVE-2026-34332 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34332 affect?

CVE-2026-34332 affects windows server 2025. Severity is high (CVSS 8.0). Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to execute code over a network.

How urgent is CVE-2026-34332?

Priority 44/100. High severity; On your watchlist

Software pages

Windows vulnerabilities · Windows Server vulnerabilities

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References

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