CVE-2026-70162
Medium CVSS 5.9Published 2026-10-13 ยท last changed 2026-10-13
The fix
Microsoft publishes remediation for this across 4 product branches. The fixed build differs per Windows version, so the row that matters is the one matching the machine you are looking at.
| Windows version | Fixed in build | Update | Released |
|---|---|---|---|
| System.Security.Cryptography.Pkcs on .NET 10.0 installed on Windows | 10.0.13 | configuration change | 2026-10-13 |
| System.Security.Cryptography.Pkcs on .NET 11.0 installed on Windows | 11.0.0-rc.2 | configuration change | 2026-10-13 |
| System.Security.Cryptography.Pkcs on .NET 8.0 installed on Windows | 8.0.2 | configuration change | 2026-10-13 |
| System.Security.Cryptography.Pkcs on .NET 9.0 installed on Windows | 9.0.21 | configuration change | 2026-10-13 |
Having the KB is not the same as knowing whether a machine has it. Windows updates supersede each other, so the update you installed often covers a fix that shipped in an earlier one. Paste your build into the patch checker and it walks that chain for you.
What it is
A denial of service vulnerability exists when Microsoft Common Object Runtime Library improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET web application. A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the .NET application. The update addresses the vulnerability by correcting how the .NET web application handles web requests.
Sources
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H