VDB
CVE-2026-109478
CVE-2026-109478
PUBLISHED
CVSS 7.5 HIGH
ASP.NET Core Denial of Service Vulnerability
Reported by microsoft · Published November 10, 2026
Inefficient algorithmic complexity in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| .NET 8.0 installed on Linux | Microsoft | 8.0.34 |
| .NET 9.0 installed on Linux | Microsoft | 9.0.0-preview.4.24266.19 |
| Microsoft Visual Studio 2026 version 18.11 | Microsoft | 18.11.4 |
Risk scores
CVSS 3.1
7.5
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
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | .NET 8.0 installed on Linux | 8.0.0 |
| Microsoft | .NET 8.0 installed on Mac OS | 8.0.0 |
| Microsoft | .NET 8.0 installed on Windows | 8.0.0 |
| Microsoft | .NET 9.0 installed on Linux | 9.0.0 |
| Microsoft | .NET 9.0 installed on Mac OS | 9.0.0 |
| Microsoft | .NET 9.0 installed on Windows | 9.0.0 |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 |
| Microsoft | Microsoft Visual Studio 2026 version 18.11 | 18.11.0 |
| Microsoft | Microsoft Visual Studio 2026 version 18.12 | 18.12.0 |
| Microsoft | .NET 8.0 installed on Linux | 8.0.0 |
| Microsoft | .NET 9.0 installed on Linux | 9.0.0 |
| Microsoft | Microsoft Visual Studio 2026 version 18.11 | 18.11.0 |
| microsoft | .net_8.0_installed_on_linux | 8.0.0 |
| microsoft | .net_9.0_installed_on_windows | 9.0.0 |
| microsoft | visual_studio_2022 | 17.14.0 |
| Microsoft | .NET 8.0 installed on Mac OS | 8.0.0 |
| Microsoft | .NET 8.0 installed on Windows | 8.0.0 |
| Microsoft | .NET 9.0 installed on Mac OS | 9.0.0 |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 |
| microsoft | .net_8.0_installed_on_mac_os | 8.0.0 |
…and 7 more
Timeline
- Nov 10, 2026 CVE Published
- Nov 11, 2026 EPSS Score
- Nov 11, 2026 Coalition ESS Score
- Nov 11, 2026 CVE Updated
- Nov 12, 2026 Security Advisory
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2026-109478
vulnetix vdb fixes CVE-2026-109478Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2026-109478/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart
References
- ASP.NET Core Denial of Service Vulnerability vendor-advisorypatch