Description
Deadlock in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Published: 2026-10-13
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service
Action: Patch Immediately
AI Analysis

Impact

A deadlock condition in ASP.NET Core can be triggered by an unauthorized attacker over the network, causing the application to become unresponsive and denying service to legitimate users. The flaw represents a concurrency control weakness identified as CWE-833, which allows the attacker to force the application into an unrecoverable state without authentication.

Affected Systems

The vulnerability affects Microsoft ASP.NET Core versions 10.0, 9.0, and 8.0, as well as Microsoft Visual Studio 2022 version 17.14 and Microsoft Visual Studio 2026 version 18.10. All these products and the listed versions are impacted; no further subversion details are specified.

Risk and Exploitability

With a CVSS score of 7.5, the vulnerability is considered high severity. The EPSS score is not available, and the flaw is not listed in the CISA KEV catalog, indicating no confirmed exploit reports at this time. The attack is possible remotely, as the deadlock can be induced by network requests to a running ASP.NET Core application, and it does not require privileged access.

Generated by OpenCVE AI on October 14, 2026 at 02:31 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest security update for ASP.NET Core 10.0, 9.0, and 8.0 released by Microsoft.
  • Apply the latest update for Visual Studio 2022 version 17.14 and Visual Studio 2026 version 18.10.
  • Implement traffic filtering or application‑level rate limiting to reduce the impact of a denial‑of‑service attack until the official patch is applied.

Generated by OpenCVE AI on October 14, 2026 at 02:31 UTC.

Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-mf4x-w4gh-4656 Microsoft Security Advisory CVE-2026-70186 - ASP.NET Core Denial of Service Vulnerability
History

Sat, 17 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Important

Wed, 14 Oct 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Tue, 13 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
Description Deadlock 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 asp.net Core
Microsoft microsoft Visual Studio 2026 Version 18.10
Microsoft visual Studio 2022
Weaknesses CWE-833
CPEs cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:microsoft_visual_studio_2026_version_18.10:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft asp.net Core
Microsoft microsoft Visual Studio 2026 Version 18.10
Microsoft visual Studio 2022
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'}

Subscriptions

Microsoft Asp.net Core Microsoft Visual Studio 2026 Version 18.10 Visual Studio 2022
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-10-31T18:06:13.645Z

Reserved: 2026-08-03T23:48:30.860Z

Link: CVE-2026-70186

cve-icon Vulnrichment

Updated: 2026-10-13T22:12:34.207Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-13T19:19:32.847

Modified: 2026-10-13T23:17:59.340

Link: CVE-2026-70186

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-13T17:00:00Z

Links: CVE-2026-70186 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-14T02:45:18Z

Weaknesses