CVE-2026-50355 Windows Active Directory Federation Services Denial of Service Vulnerability

What is CVE-2026-50355?

CVE-2026-50355 is a high-severity memory corruption vulnerability in Microsoft .Net Framework, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Stack-based buffer overflow in Active Directory Federation Services allows an unauthorized attacker to deny service over a network.

Weakness: CWE-121

Which versions are affected by CVE-2026-50355?

It affects 8 products.

Products include Microsoft .Net Framework, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019 and 2 more.

How do I fix CVE-2026-50355?

No fix has been published for CVE-2026-50355 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-50355 being exploited?

There is no known exploitation of CVE-2026-50355 in the wild and no public exploit code.

Other vulnerabilities in Microsoft .Net Framework

• CVE-2020-0646 Microsoft .NET Framework Remote Code Execution Exploited Critical 9.8
• CVE-2017-8759 Microsoft .NET Framework Remote Code Execution Exploited High 7.8
• CVE-2015-1671 Microsoft Windows Remote Code Execution Exploited High 7.8
• CVE-2024-29059 Microsoft .NET Framework Information Disclosure Exploited High 7.5
• CVE-2014-4073 Privilege escalation in n/a Critical 10.0

All Microsoft .Net Framework vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-jw44-x36j-888r.