undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields
CVE-2026-16729
Summary
Concurrent execution using shared resource with improper synchronization ('race condition') in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
Products covered
Microsoft Visual Studio 2022 version 17.14
ASP.NET Core 10.0
ASP.NET Core 8.0
ASP.NET Core 9.0
Microsoft Visual Studio 2026 version 18.10
ASP.NET Core 11.0
Remediation
Release Notes Install KB5130036. Install KB5130034. Install KB5130035.
Vendor-listed fixes
17.14.42
10.0.13
8.0.32
9.0.21
18.10.4
11.0.0-rc.2
CVEs in this advisory 1
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.
- Confirmed at the source
Our collector saw this advisory during a later source check.