undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields
CVE-2026-16729
Summary
Heap-based buffer overflow in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
Products covered
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Show 12 more products
Windows 11 Version 26H2 for ARM64-based Systems
Windows 11 Version 26H2 for x64-based Systems
Windows Server 2025
Windows Server 2025 (Server Core installation)
Windows 11 Version 26H1 for ARM64-based Systems
Windows 11 version 26H1 for x64-based Systems
Microsoft Visual Studio 2026 version 18.10
Microsoft Visual Studio 2022 version 17.14
.NET 8.0 installed on Windows
.NET 9.0 installed on Windows
.NET 10.0 installed on Windows
.NET 11.0 installed on Windows
Remediation
Release Notes Install KB5126655. Install KB5126653. Install KB5127648. Install KB5126646. Install KB5127646. Install KB5130034. Install KB5130035.
Vendor-listed fixes
10.0.20348.5761
10.0.22631.7652
10.0.26100.9711
10.0.26200.9711
10.0.26300.9711
10.0.26100.33650
10.0.28000.3231
18.10.4
Show 5 more fixes
17.14.42
8.0.32
9.0.21
10.0.14
11.0.0-rc.2.26504.105
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 its remediation guidance.
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.