Summary
Impact: Denial of Service. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.
Security updates
2.0.50727.9181 & 3.0.30729.9165 & 4.8.4801.0 — https://support.microsoft.com/help/5082426
2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0 — https://support.microsoft.com/help/5082424
4.8.4801.0 — https://support.microsoft.com/help/5082411
4.8.4801.0 — https://support.microsoft.com/help/5082403
4.8.4801.0 — https://support.microsoft.com/help/5082404
2.0.50727.9068 & 3.0.30729.9065 & 4.8.4801.0 — https://support.microsoft.com/help/5082414
2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0 — https://support.microsoft.com/help/5082419
2.0.50727.9068 & 3.0.30729.9065 & 4.7.4141.0 — https://support.microsoft.com/help/5082413
2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0 — https://support.microsoft.com/help/5082425
2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0 — https://support.microsoft.com/help/5082418
2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0 — https://support.microsoft.com/help/5082420
2.0.50727.8982 & 3.0.30729.8976 — https://support.microsoft.com/help/5082406
2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0 — https://support.microsoft.com/help/5082421
2.0.50727.9181 & 3.0.30729.9165 & 4.8.4801.0 — https://support.microsoft.com/help/5082427
4.8.4801.0 — https://support.microsoft.com/help/5082400
4.7.4141.0 — https://support.microsoft.com/help/5082402
2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0 — https://support.microsoft.com/help/5082417
2.0.50727.8982 & 3.0.30729.8976 — https://support.microsoft.com/help/5082398
Vulnerabilities 1
-
Medium 5.9
.NET Framework Denial of Service Vulnerability
Concurrent execution using shared resource with improper synchronization ('race condition') in .NET Framework allows an unauthorized attacker to deny service over a network.
Revision history
-
#2
Additional entries have been included in the Security Updates table to include the server versions of .NET Framework. Customers that are running supported version of .NET Framework are encouraged to update to the indicated version to be protected from this vulnerability.
-
#1
Information published.
References
-
CVE-2026-32226 .NET Framework Denial of Service Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32226
-
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
-
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
-
Common Vulnerability Scoring System
https://www.first.org/cvss