Is there a public exploit for CVE-2026-109478?

No public exploit for CVE-2026-109478 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-109478?

CVE-2026-109478 scores CVSS 6.5 (v3.1), rated medium.

What does CVE-2026-109478 affect?

CVE-2026-109478 affects Microsoft.AspNetCore.App.Runtime.linux-arm, Microsoft.AspNetCore.App.Runtime.linux-arm64, Microsoft.AspNetCore.App.Runtime.linux-musl-arm, Microsoft.AspNetCore.App.Runtime.linux-musl-arm64, Microsoft.AspNetCore.App.Runtime.linux-musl-x64, Microsoft.AspNetCore.App.Runtime.linux-x64.

6.5 Medium

Microsoft Security Advisory CVE-2026-109478 - ASP.NET Core Denial of Service Vulnerability

CVE-2026-109478

Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core. This advisory provides guidance on updating affected applications and components. Processing comma-separated HTTP header values can cause excessive allocations and resource exhaustion. Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/515 CVSS Details Version: 3.1 Severity: High Score: 7.5 (base score) 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 Weakness: CWE-407 Affected Platforms Platforms: Windows, Linux, macOS Architectures: All Affected Packages The tables list affected version ranges and fixed package versions. Runtime and standalone deliveries are listed separately. .NET 8.0 - affected runtime packages Package | Affected version | Patched version | --- | --- [Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm) | >= 8.0.0-preview.1.23112.2, = 8.0.0-preview.1.23112.2, = 8.0.0-preview.1.23112.2, = 8.0.0-preview.1.23112.2, = 8.0.0-preview.1.23112.2, = 8.0.0-preview.1.23112.2, = 8.0.0-preview.1.23112.2, =…

Assessment

CVSS: 6.5 (v3.1)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 11 November 2026
Last updated: 11 November 2026
Affected: Microsoft.AspNetCore.App.Runtime.linux-arm · Microsoft.AspNetCore.App.Runtime.linux-arm64 · Microsoft.AspNetCore.App.Runtime.linux-musl-arm · Microsoft.AspNetCore.App.Runtime.linux-musl-arm64
Weakness: CWE-407

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

At the source

GitHub Advisories

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