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High

Cookie parsing failure

  • Disclosed: 24.05.2022
  • Updated: 11.10.2026 11:23

A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names.The ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker to set a second cookie with the name being percent encoded.The security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names., aka 'Microsoft ASP.NET Core Security Feature Bypass Vulnerability'.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
.NET (NuGet) Microsoft.AspNetCore.App < 2.1.22 2.1.22
.NET (NuGet) Microsoft.AspNetCore.App.Runtime.linux-arm >= 3.1.0, < 3.1.8 3.1.8
.NET (NuGet) Microsoft.AspNetCore.App.Runtime.linux-arm64 >= 3.1.0, < 3.1.8 3.1.8
.NET (NuGet) Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 >= 3.1.0, < 3.1.8 3.1.8
.NET (NuGet) Microsoft.AspNetCore.App.Runtime.linux-musl-x64 >= 3.1.0, < 3.1.8 3.1.8
.NET (NuGet) Microsoft.AspNetCore.App.Runtime.linux-x64 >= 3.1.0, < 3.1.8 3.1.8
.NET (NuGet) Microsoft.AspNetCore.App.Runtime.osx-x64 >= 3.1.0, < 3.1.8 3.1.8
.NET (NuGet) Microsoft.AspNetCore.App.Runtime.win-arm >= 3.1.0, < 3.1.8 3.1.8
.NET (NuGet) Microsoft.AspNetCore.App.Runtime.win-arm64 >= 3.1.5, < 3.1.8 3.1.8
.NET (NuGet) Microsoft.AspNetCore.App.Runtime.win-x64 >= 3.1.0, < 3.1.8 3.1.8
.NET (NuGet) Microsoft.AspNetCore.App.Runtime.win-x86 >= 3.1.0, < 3.1.8 3.1.8
.NET (NuGet) Microsoft.AspNetCore.Http < 2.1.22 2.1.22
.NET (NuGet) Microsoft.Owin < 4.1.1 4.1.1

References

CVSS score 7.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE)
-
Platform
.NET (NuGet)
Package
Microsoft.AspNetCore.App, Microsoft.AspNetCore.App.Runtime.linux-arm, Microsoft.AspNetCore.App.Runtime.linux-arm64
Disclosed
24.05.2022
Updated
11.10.2026 11:23

Sources and licenses

OSV / GitHub Advisory Database - GHSA-hxrm-9w7p-39cc - CC BY 4.0

Vulnerability history: Microsoft.AspNetCore.App.Runtime.win-arm

All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (25) in the archive
Total entries
25
First → latest
05.2022 07.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 2
  • High 20
  • Medium 3

Disclosures per year

Severity:
  1. Microsoft Security Advisory CVE-2026-56170 – .NET Denial of Service Vulnerability
    High · 7.5 CVE-2026-56170 >= 10.0.0, < 10.0.6, >= 9.0.0, < 9.0.15, >= 8.0.0, < 8.0.26 10.0.6, 9.0.15, 8.0.26
  2. Microsoft Security Advisory CVE-2026-42899 – ASP.NET Core Denial of Service Vulnerability
    High · 7.5 CVE-2026-42899 >= 8.0.0, < 8.0.27, >= 9.0.0, < 9.0.16, >= 10.0.0, < 10.0.8 8.0.27, 9.0.16, 10.0.8
  3. .NET Denial of Service Vulnerability
    High · 7.5 CVE-2026-26130 >= 8.0.0, < 8.0.25, >= 9.0.0, < 9.0.14, >= 10.0.0, < 10.0.4 8.0.25, 9.0.14, 10.0.4
  4. Microsoft Security Advisory CVE-2025-55315: .NET Security Feature Bypass Vulnerability
    Critical · 9.9 CVE-2025-55315 >= 10.0.0-rc.1.25451.107, < 10.0.0-rc.2.25502.107, >= 9.0.0, < 9.0.10, >= 8.0.0, < 8.0.21 10.0.0-rc.2.25502.107, 9.0.10, 8.0.21
  5. Microsoft Security Advisory CVE-2025-24070: .NET Elevation of Privilege Vulnerability
    High · 7.0 CVE-2025-24070 >= 8.0.0, < 8.0.14, >= 9.0.0, < 9.0.3, >= 6.0.0, <= 6.0.36 8.0.14, 9.0.3
  6. Microsoft Security Advisory CVE-2024-38229 | .NET Remote Code Execution Vulnerability
    High · 8.1 CVE-2024-38229 >= 9.0.0-preview.1.24081.5, < 9.0.0-rc.2.24474.3, >= 8.0.0, < 8.0.10 9.0.0-rc.2.24474.3, 8.0.10
  7. Microsoft Security Advisory CVE-2024-38168 | .NET Denial of Service Vulnerability
    High · 7.5 CVE-2024-38168 >= 8.0.0, < 8.0.8 8.0.8
  8. Microsoft Security Advisory CVE-2024-35264 | .NET Remote Code Execution Vulnerability
    Critical · 8.1 CVE-2024-35264 >= 8.0.0, < 8.0.7 8.0.7
  9. Microsoft Security Advisory CVE-2024-21386: .NET Denial of Service Vulnerability
    High · 7.5 CVE-2024-21386 < 6.0.27, >= 7.0.0, < 7.0.16, >= 8.0.0, < 8.0.2 6.0.27, 7.0.16, 8.0.2
  10. .NET Denial of Service Vulnerability
    High · 7.5 CVE-2023-38178 >= 7.0.0, < 7.0.10 7.0.10
  11. Microsoft Security Advisory CVE-2023-33170: .NET Security Feature Bypass Vulnerability
    High · 8.1 CVE-2023-33170 < 6.0.20, >= 7.0.0, < 7.0.9 6.0.20, 7.0.9
  12. .NET Denial of Service Vulnerability
    High · 7.5 CVE-2022-23267 >= 3.0.0, < 3.1.25, >= 5.0.0, < 5.0.17, >= 6.0.0, < 6.0.5 3.1.25, 5.0.17, 6.0.5
  13. .NET Denial of Service Vulnerability
    High · 7.5 CVE-2022-24464 >= 3.0.0, < 3.1.23, >= 5.0.0, < 5.0.15, >= 6.0.0, < 6.0.3 3.1.23, 5.0.15, 6.0.3
  14. .NET Denial of Service Vulnerability
    High · 7.5 CVE-2022-21986 >= 5.0.0, < 5.0.14, >= 6.0.0, < 6.0.2 5.0.14, 6.0.2
  15. .NET Denial of Service Vulnerability
    High · 7.5 CVE-2022-38013 >= 3.1.0, < 3.1.29, >= 5.0.0, < 6.0.9 3.1.29, 6.0.9
  16. .NET Denial of Service Vulnerability
    High · 7.5 CVE-2022-29145 >= 3.0.0, < 3.1.25, >= 5.0.0, < 5.0.17, >= 6.0.0, < 6.0.5 3.1.25, 5.0.17, 6.0.5
  17. .NET Denial of Service Vulnerability
    High · 7.5 CVE-2022-29117 >= 3.0.0, < 3.1.25, >= 5.0.0, < 5.0.17, >= 6.0.0, < 6.0.5 3.1.25, 5.0.17, 6.0.5
  18. ASP.NET Core and Visual Studio Denial of Service Vulnerability
    High · 7.5 CVE-2021-1723 >= 3.1.0, < 3.1.11, >= 5.0.0, < 5.0.2 3.1.11, 5.0.2
  19. Cookie parsing failure this entry
    High · 7.5 CVE-2020-1045 >= 3.1.0, < 3.1.8 3.1.8
  20. ASP.NET Core Denial of Service Vulnerability
    High · 7.5 CVE-2020-1597 >= 3.1.0, < 3.1.7 3.1.7
Show more (2) Showing 20 of 22

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