CVE-2026-56170
published 2026-07-14CVE-2026-56170: Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.
PriorityP347high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
1.01%
61.0th percentile
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Affected
42 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft.aspnetcore.app.runtime.linux-arm | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-arm | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-arm | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-arm64 | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-arm64 | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-arm64 | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-musl-arm | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-musl-arm | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-musl-arm | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-musl-arm64 | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-musl-arm64 | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-musl-arm64 | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-musl-x64 | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-musl-x64 | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-musl-x64 | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-x64 | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-x64 | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.aspnetcore.app.runtime.linux-x64 | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.aspnetcore.app.runtime.osx-arm64 | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.aspnetcore.app.runtime.osx-arm64 | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.aspnetcore.app.runtime.osx-arm64 | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.aspnetcore.app.runtime.osx-x64 | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.aspnetcore.app.runtime.osx-x64 | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.aspnetcore.app.runtime.osx-x64 | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.aspnetcore.app.runtime.win-arm | >= 10.0.0 < 10.0.6 | 10.0.6 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
ghsa7.5HIGH
vendor_redhat7.5HIGH
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GHSA
Microsoft Security Advisory CVE-2026-56170 – .NET Denial of Service Vulnerability
ghsa·2026-07-21·CVSS 7.5
CVE-2026-56170 [HIGH] CWE-770 Microsoft Security Advisory CVE-2026-56170 – .NET Denial of Service Vulnerability
Microsoft Security Advisory CVE-2026-56170 – .NET Denial of Service Vulnerability
# Microsoft Security Advisory CVE-2026-56170 – .NET Denial of Service Vulnerability
## Executive summary
Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core SignalR (Microsoft.AspNetCore.App.Runtime). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
A denial of service vulnerability exists in ASP.NET Core SignalR in .NET 8, .NET 9, and .NET 10. Stateful reconnect can be leveraged by an attacker to deny service to other users.
## Announcement
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/**TBD**
## CVSS Details
- **Version:** 3.1
-
VulDB
Microsoft ASP.NET allocation of resources (Nessus ID 327681)
vuldb·2026-07-20·CVSS 7.5
CVE-2026-56170 [HIGH] Microsoft ASP.NET allocation of resources (Nessus ID 327681)
A vulnerability was found in Microsoft ASP.NET. It has been rated as problematic. Affected is an unknown function. This manipulation causes allocation of resources.
This vulnerability is registered as CVE-2026-56170. Remote exploitation of the attack is possible. No exploit is available.
Upgrading the affected component is advised.
Red Hat
ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation
vendor_redhat·2026-07-14·CVSS 7.5
CVE-2026-56170 [HIGH] CWE-770 ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation
ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.
A flaw was found in ASP.NET Core. This vulnerability allows an unauthorized remote attacker to cause a Denial of Service (DoS) by allocating resources without proper limits or throttling. This can lead to the affected system becoming unresponsive or unavailable to legitimate users.
Package: dotnet10.0 (Red Hat Enterprise Linux 10) - Affected
Package: dotnet8.0 (Red Hat Enterprise Linux 10) - Affected
Package: dotnet9.0 (Red Hat Enterprise Linux 10) - Affected
Package: dotnet10.0 (Red Hat Enterprise Linux 8) - Affected
Package: dotnet8.0 (Red Hat Enterprise Linux 8) - Aff
No detection rules found.
No public exploits indexed.
Rapid7
Patch Tuesday - July 2026
blogs_rapid7·2026-07-14·CVSS 9.6
CVE-2026-58617 [CRITICAL] Patch Tuesday - July 2026
Microsoft is publishing 622 vulnerabilities on July 2026 Patch Tuesday , including a record-breaking 416 Windows vulnerabilities. Microsoft is aware of exploitation in the wild for two of the vulnerabilities published today, both of which are listed on CISA KEV, as well as public disclosure for one other. As usual, browser vulns are not included in the Patch Tuesday count above. Rapid7 noted last month that Microsoft no longer enumerates Chromium CVEs in the Security Update Guide. However, Microsoft has now taken the pursuit of minimalism much further, since today’s Security Update Guide no longer lists out even Microsoft vulnerabilities! Instead, we now receive a summary table of vulnerability counts by product family, as well as a new slimline “Notable CVEs” section. All of this only ser
Sans Isc
Microsoft Patch Tuesday July 2026 - The AI Acopolypse is Here , (Tue, Jul 14th)
blogs_sans_isc·2026-07-14·CVSS 6.1
CVE-2026-56155 [MEDIUM] Microsoft Patch Tuesday July 2026 - The AI Acopolypse is Here , (Tue, Jul 14th)
Microsoft Patch Tuesday July 2026 - The AI Acopolypse is Here
Published: 2026-07-14. Last Updated: 2026-07-14 19:14:58 UTC
by Johannes Ullrich (Version: 1)
0 comment(s)
This patch Tuesday includes a staggering 622 vulnerabilities, not including another 427 vulnerabilities in Chromium, affecting Microsoft's Edge browser. 62 of the vulnerabilities are rated critical. One was disclosed before today, and two have already been exploited.
Given the large number of vulnerabilities, it is difficult to point out "noteworthy" issues.
Already exploited vulnerabilities:
CVE-2026-56155 : Active Directory Federation Services Elevation of Privilege Vulnerability. This is an important (not critical) vulnerablity.
CVE-2026-56164: Microsoft SharePoint Server Elevation of Privilege Vulnerability. Micr
Bugzilla
CVE-2026-56170 dotnet9.0: ASP.NET Core: Denial of Service via uncontrolled resource allocation [fedora-all]
bugzilla·2026-07-16·CVSS 7.5
CVE-2026-56170 [HIGH] CVE-2026-56170 dotnet9.0: ASP.NET Core: Denial of Service via uncontrolled resource allocation [fedora-all]
CVE-2026-56170 dotnet9.0: ASP.NET Core: Denial of Service via uncontrolled resource allocation [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Bugzilla
CVE-2026-56170 dotnet10.0: ASP.NET Core: Denial of Service via uncontrolled resource allocation [fedora-all]
bugzilla·2026-07-16·CVSS 7.5
CVE-2026-56170 [HIGH] CVE-2026-56170 dotnet10.0: ASP.NET Core: Denial of Service via uncontrolled resource allocation [fedora-all]
CVE-2026-56170 dotnet10.0: ASP.NET Core: Denial of Service via uncontrolled resource allocation [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Bugzilla
CVE-2026-56170 dotnet8.0: ASP.NET Core: Denial of Service via uncontrolled resource allocation [fedora-all]
bugzilla·2026-07-16·CVSS 7.5
CVE-2026-56170 [HIGH] CVE-2026-56170 dotnet8.0: ASP.NET Core: Denial of Service via uncontrolled resource allocation [fedora-all]
CVE-2026-56170 dotnet8.0: ASP.NET Core: Denial of Service via uncontrolled resource allocation [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Bugzilla
CVE-2026-56170 ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation
bugzilla·2026-07-14·CVSS 7.5
CVE-2026-56170 [HIGH] CVE-2026-56170 ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation
CVE-2026-56170 ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.
2026-07-14
Published