CVE-2026-42899

ASP.NET Core Denial of Service Vulnerability

Published May 12, 2026 CVSS 3.1 · 7.5 High EPSS 2.4% KEV · Not listed
Description
Loop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-9v76-4qcc-frgh Microsoft Security Advisory CVE-2026-42899 – ASP.NET Core Denial of Service Vulnerability
Ubuntu USN Ubuntu USN USN-8298-1 .NET vulnerability
History
Type Values Removed Values Added
First Time appeared Apple
Apple macos
Linux
Linux linux Kernel
Microsoft windows
CPEs cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
Vendors & Products Apple
Apple macos
Linux
Linux linux Kernel
Microsoft windows
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Loop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Title ASP.NET Core Denial of Service Vulnerability
First Time appeared Microsoft
Microsoft .net
Weaknesses CWE-835
CPEs cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft .net
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Aug 10, 2026, 3:13 PM
Reserved
Apr 30, 2026, 10:35 PM
Status
Modified
Published
May 12, 2026, 6:17 PM
Modified
Oct 26, 2026, 6:10 PM
Severity
Important
Public date
May 12, 2026, 4:59 PM