CVE-2026-32226: Concurrent execution using shared resource with improper synchronization ('race condition') in .NET Framework

This month

MEDIUM 5.9REMOTEWATCHLISTDOWNGRADE

CVE-2026-32226 is a medium-severity flaw (CVSS 5.9) affecting .net framework. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Concurrent execution using shared resource with improper synchronization ('race condition') in .NET Framework allows an unauthorized attacker to deny service over a network.

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-362
Published	2026-04-14
Last modified	2026-07-25

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-07-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-14 18:17 UTCPublished CVE record published
2026-07-25 11:10 UTCUpdated Record last modified

microsoft .net framework DOWNGRADE

Affected: 3.5 · 4.7.2 · 4.8 · 4.8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.5

1. Check installed version

apt-cache policy .net-framework || rpm -q .net-framework || .net-framework --version

2. No fixed release: DOWNGRADE to a release before 3.5 (Debian / Ubuntu)

apt-cache madison .net-framework sudo apt install .net-framework=<VERSION_BEFORE_3.5> sudo apt-mark hold .net-framework

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list .net-framework sudo dnf downgrade .net-framework-<VERSION_BEFORE_3.5> sudo dnf versionlock add .net-framework

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-32226?

.net framework: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-32226 being exploited?

CVE-2026-32226 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-2026-32226 affect?

CVE-2026-32226 affects .net framework. Severity is medium (CVSS 5.9). Concurrent execution using shared resource with improper synchronization ('race condition') in .NET Framework allows an unauthorized attacker to deny service over a network.

How urgent is CVE-2026-32226?

Priority 42/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

.NET vulnerabilities

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References

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