undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields
CVE-2026-16729
Summary
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.
Products covered
System.Security.Cryptography.Pkcs on .NET 10.0 installed on Windows
System.Security.Cryptography.Pkcs on .NET 11.0 installed on Windows
System.Security.Cryptography.Pkcs on .NET 8.0 installed on Windows
System.Security.Cryptography.Pkcs on .NET 9.0 installed on Windows
Microsoft Visual Studio 2026 version 18.10
Microsoft Visual Studio 2022 version 17.14
Remediation
Release Notes
Vendor-listed fixes
10.0.13
11.0.0-rc.2
8.0.2
9.0.21
18.10.4
17.14.42
CVEs in this advisory 1
Update history
What changed in later vendor updates
SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.
- The vendor changed the advisory's last-updated date.
- The vendor changed the advisory's last-updated date.
Updates
- Published by Microsoft Security Response Center
The publication date reported by the vendor.
- Added to SecurityAlert
We collected the advisory from the official source.
- Updated by Microsoft Security Response Center
The vendor changed the advisory after it was first published.
- Confirmed at the source
Our collector saw this advisory during a later source check.