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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-45591

33
FAUCET Score

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

First published: Jun 9, 2026Last modified: Jun 9, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 8.0.0, < 8.0.28CPE matchmatch criteria
cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*
>= 9.0.0, < 9.0.17CPE matchmatch criteria
cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*
>= 10.0.0, < 10.0.9CPE matchmatch criteria
cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*
>= 18.6.0, < 18.6.3CPE matchmatch criteria
cpe:2.3:a:microsoft:visual_studio_2026:*:*:*:*:*:*:*:*
>= 8.0.0, < 8.0.28CPE matchmatch criteria
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.43%
Probability of exploitation in next 30 days
EPSS Percentile
82.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0243 is in the 69th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (25)

microsoftpatch availablevia msrc
Product: Microsoft Visual Studio 2026 version 18.6Fixed in: 18.6.3
View patch
microsoftpatch availablevia msrc
Product: .NET 10.0 installed on WindowsFixed in: 10.0.9
View patch
microsoftpatch availablevia msrc
Product: .NET 10.0 installed on Mac OSFixed in: 10.0.9
View patch
microsoftpatch availablevia msrc
Product: ASP.NET Core 10.0Fixed in: 10.0.9
View patch
microsoftpatch availablevia msrc
Product: .NET 10.0 installed on LinuxFixed in: 10.0.9
View patch
microsoftpatch availablevia msrc
Product: ASP.NET Core 8.0Fixed in: 8.0.28
View patch
microsoftpatch availablevia msrc
Product: .NET 8.0 installed on WindowsFixed in: 8.0.28
View patch
microsoftpatch availablevia msrc
Product: .NET 8.0 installed on LinuxFixed in: 8.0.28
View patch
microsoftpatch availablevia msrc
Product: .NET 8.0 installed on Mac OSFixed in: 8.0.28
View patch
microsoftpatch availablevia msrc
Product: .NET 9.0 installed on Mac OSFixed in: 9.0.17
View patch
microsoftpatch availablevia msrc
Product: .NET 9.0 installed on LinuxFixed in: 9.0.17
View patch
microsoftpatch availablevia msrc
Product: .NET 9.0 installed on WindowsFixed in: 9.0.17
View patch
microsoftpatch availablevia msrc
Product: ASP.NET Core 9.0Fixed in: 9.0.17
View patch
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-x64Fixed in: 8.0.28
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-x64Fixed in: 9.0.17
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-x64Fixed in: 10.0.9
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.win-x64Fixed in: 8.0.28
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.win-x64Fixed in: 9.0.17
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.win-x64Fixed in: 10.0.9
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.osx-arm64Fixed in: 8.0.28
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.osx-arm64Fixed in: 9.0.17
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.osx-arm64Fixed in: 10.0.9
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.SignalR.Protocols.MessagePackFixed in: 8.0.28
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.SignalR.Protocols.MessagePackFixed in: 9.0.17
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.SignalR.Protocols.MessagePackFixed in: 10.0.9

Vendor Advisories (2)

nugetGHSA-f8h2-vmm9-qhj6high

Microsoft Security Advisory CVE-2026-45591 – ASP.NET Core Denial of Service Vulnerability

Jun 15, 2026
microsoft2026-Jun/CVE-2026-45591Important

ASP.NET Core Denial of Service Vulnerability

Jun 9, 2026

References

access.redhat.com / errata/RHSA-2026:17527
access.redhat.com / errata/RHSA-2026:25110
access.redhat.com / errata/RHSA-2026:25111
access.redhat.com / errata/RHSA-2026:25112
access.redhat.com / errata/RHSA-2026:25113
access.redhat.com / errata/RHSA-2026:25114
access.redhat.com / errata/RHSA-2026:25115
access.redhat.com / errata/RHSA-2026:25220
access.redhat.com / errata/RHSA-2026:25221
access.redhat.com / errata/RHSA-2026:25222
access.redhat.com / errata/RHSA-2026:26638
access.redhat.com / errata/RHSA-2026:26994
access.redhat.com / errata/RHSA-2026:28007
access.redhat.com / errata/RHSA-2026:28009
access.redhat.com / errata/RHSA-2026:28011
access.redhat.com / errata/RHSA-2026:28051
access.redhat.com / errata/RHSA-2026:28227
access.redhat.com / security/cve/CVE-2026-45591
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-45591.json
msrc.microsoft.com / update-guide/vulnerability/CVE-2026-45591
Vendor Advisory