CVE-2026-45591

ASP.NET Core Denial of Service Vulnerability

HIGH

7.5

CVSS Score

Published: June 9, 2026 at 05:05 PM UTC

Updated: July 23, 2026 at 07:32 PM UTC

4 products affected across 1 vendor.netASP.NET CoreVisual Studio 2026· also runs on 2 platforms

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Severity

HIGH7.5

Exploit prediction

EPSS 2%

SSVC

No known exploit

Description

Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

ASP.NET Core · Microsoft

95%

10.0 ≤ v < 10.0.910.0.0 ≤ v < 10.0.98.0 ≤ v < 8.0.288.0.0 ≤ v < 8.0.289.0 ≤ v < 9.0.179.0.0 ≤ v < 9.0.1710.0 8.0 9.0

Affected range stops below 10.0.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.0.28, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.0.17, so it looks safe — our inference, not a vendor statement

.net · Microsoft

95%

10.0.0 ≤ v < 10.0.98.0.0 ≤ v < 8.0.289.0.0 ≤ v < 9.0.1710.0.0 8.0.0 9.0.0

Affected range stops below 10.0.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.0.28, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.0.17, so it looks safe — our inference, not a vendor statement

apple-macos (environment) · linux-linux-kernel (environment) · microsoft-windows (environment)

Visual Studio 2026 · Microsoft

95%

18.6.0 ≤ v < 18.6.318.6.0

Affected range stops below 18.6.3, so it looks safe — our inference, not a vendor statement

Windows · Microsoftdevice

80%

All versions

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

macOS · Apple

95%

Linux Kernel · Linux

95%

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45591