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High 7.5Published Jul 14, 2026
CVE-2026-50355Windows Active Directory Federation Services Denial of Service Vulnerability
Updated under an hour ago ()
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It affects Microsoft .NET Framework 3.5 AND 4.7.2 and 14 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Stack-based buffer overflow in Active Directory Federation Services allows an unauthorized attacker to deny service over a network.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
- Weakness (CWE)
- CWE-121
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 microsoft:net_framework_3.5_and_4.7.2 (from the name) | 4.7.0 builds before 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 | CNA record |
Microsoft Microsoft .NET Framework 3.5 AND 4.8 microsoft:net_framework_3.5_and_4.8 (from the name) | 4.8.0 builds before 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 | CNA record |
Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 microsoft:net_framework_3.5_and_4.8.1 (from the name) | 4.8.1 builds before 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 | CNA record |
Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 microsoft:net_framework_4.6.2_4.7_4.7.1_4.7.2 (from the name) | from 4.7.0 before 4.7.4143.0 | CNA record |
Microsoft Microsoft .NET Framework 4.8 microsoft:net_framework_4.8 (from the name) | from 4.8.0 before 4.8.4803.0 | CNA record |
Microsoft Microsoft .NET Framework 4.8.1 microsoft:net_framework_4.8.1 (from the name) | from 4.8.0.0 before 4.8.9340.0 | CNA record |
Microsoft Windows 10 Version 1607 microsoft:windows_10_1607 | from 10.0.14393.0 before 10.0.14393.9339 | CNA record |
Microsoft Windows 10 Version 1809 microsoft:windows_10_1809 | from 10.0.17763.0 before 10.0.17763.9020 | CNA record |
Microsoft Windows Server 2012 microsoft:windows_server_2012 (from the name) | from 6.2.9200.0 before 6.2.9200.26226 | CNA record |
Microsoft Windows Server 2012 R2 microsoft:windows_server_2012_r2 (from the name) | from 6.3.9600.0 before 6.3.9600.23291 | CNA record |
Microsoft Windows Server 2016 microsoft:windows_server_2016 (from the name) | from 10.0.14393.0 before 10.0.14393.9339 | CNA record |
Microsoft Windows Server 2019 microsoft:windows_server_2019 (from the name) | from 10.0.17763.0 before 10.0.17763.9020 | CNA record |
Microsoft Windows Server 2022 microsoft:windows_server_2022 (from the name) | from 10.0.20348.0 before 10.0.20348.5386 | CNA record |
Microsoft Windows Server 2025 microsoft:windows_server_2025 (from the name) | from 10.0.26100.0 before 10.0.26100.33158 | CNA record |
microsoft windows_10_1607 microsoft:windows_10_1607 | before 10.0.14393.9339; before 10.0.14393.9339 | NVD |
microsoft windows_10_1809 microsoft:windows_10_1809 | before 10.0.17763.9020; before 10.0.17763.9020 | NVD |
microsoft windows_server_2012 microsoft:windows_server_2012 | all versions; r2 | NVD |
microsoft windows_server_2016 microsoft:windows_server_2016 | before 10.0.14393.9339 | NVD |
microsoft windows_server_2019 microsoft:windows_server_2019 | before 10.0.17763.9020 | NVD |
microsoft windows_server_2022 microsoft:windows_server_2022 | before 10.0.20348.5386 | NVD |
microsoft windows_server_2025 microsoft:windows_server_2025 | before 10.0.26100.33158 | NVD |
microsoft .net_framework microsoft:.net_framework | 4.8.1; 4.8; 4.6.2; 4.7; 4.7.1; 4.7.2; 3.5; 4.8.1; and 4 more ranges | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50355vendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.