CVE-2026-26130: ASP.NET Core Denial of Service Vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-10 · updated 2026-07-15
Weakness: CWE-770

Description

Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Affected products

Microsoft .NET Core: from 8.0.0 before 8.0.25; from 9.0.0 before 9.0.14; from 10.0.0 before 10.0.4 — fixed in 10.0.4, 8.0.25, 9.0.14
Microsoft ASP.NET Core 10.0: from 10.0 before 10.0.4 — fixed in 10.0.4
Microsoft ASP.NET Core 8.0: from 8.0 before 8.0.25 — fixed in 8.0.25
Microsoft ASP.NET Core 9.0: from 9.0 before 9.0.14 — fixed in 9.0.14

How to fix

Upgrade to a fixed version: Microsoft .NET Core 10.0.4, 8.0.25, 9.0.14; Microsoft ASP.NET Core 10.0 10.0.4; Microsoft ASP.NET Core 8.0 8.0.25; Microsoft ASP.NET Core 9.0 9.0.14. Check the vendor advisory for mitigations.

References

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