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No exploitation reportedAwaiting NVD analysis

CVE-2026-109478

ASP.NET Core Denial of Service Vulnerability

No exploitation reported by the sources we read.

  • Published2026-11-10
  • WeaknessCWE-407

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Inefficient algorithmic complexity in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Timeline

dates in UTC
  1. 2026-11-1018:15CVE publishedCNA

Versions per branch

Products declared by the CNA

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Microsoft .NET 8.0 installed on Linux
    Affected
    • ≥ 8.0.0, < 8.0.34fixed in 8.0.34custom
  • Microsoft .NET 8.0 installed on Mac OS
    Affected
    • ≥ 8.0.0, < 8.0.34fixed in 8.0.34custom
  • Microsoft .NET 8.0 installed on Windows
    Affected
    • ≥ 8.0.0, < 8.0.34fixed in 8.0.34custom
  • Microsoft Visual Studio 2022 version 17.14
    Affected
    • ≥ 17.14.0, < 17.14.45fixed in 17.14.45custom
  • Microsoft Visual Studio 2026 version 18.11
    Affected
    • ≥ 18.11.0, < 18.11.4fixed in 18.11.4custom
  • Microsoft Visual Studio 2026 version 18.12
    Affected
    • ≥ 18.12.0, < 18.12.0fixed in 18.12.0custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-10

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-109478 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.17.52026-11-10
  • NVDCVSS 3.17.5read 2026-11-10
  • CNAweakness (CWE)CWE-4072026-11-10
  • NVDweakness (CWE)CWE-407read 2026-11-10

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-11-10
Last Modified
2026-11-10
NVD status
Awaiting Analysis

Frequently asked questions

What is CVE-2026-109478?

Inefficient algorithmic complexity in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Is CVE-2026-109478 actively exploited?

Active exploitation of CVE-2026-109478 has not been confirmed.

What is the CVSS score for CVE-2026-109478?

CVE-2026-109478 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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