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High, CVSS 7.5amended

Microsoft Security Advisory CVE-2026-50524 – .NET Denial of Service Vulnerability

CVE-2026-50524GHSA-w7cw-xp7h-6j5j

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (microsoft.netcore.app.runtime.win-x86 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.win-arm64 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.linux-musl-x64 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.linux-arm64 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.linux-arm 10.0.10, 9.0.18, 8.0.29; 7 more packages under Affected packages), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-w7cw-xp7h-6j5j lists affected ranges: NuGet microsoft.netcore.app.runtime.linux-arm >=10.0.0 =9.0.0 =8.0.0 =10.0.0 =9.0.0 =8.0.0 =10.0.0 =9.0.0 =8.0.0 =10.0.0 =9.0.0 =8.0.0 <=8.0.28; NuGet…

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

  • Open Source Vulnerabilities (OSV.dev), including the GitHub Advisory Database

    OSV record GHSA-w7cw-xp7h-6j5j lists affected ranges: NuGet microsoft.netcore.app.runtime.linux-arm >=10.0.0 =9.0.0 =8.0.0 =10.0.0 =9.0.0 =8.0.0 =10.0.0 =9.0.0 =8.0.0 =10.0.0…

    VerifiedObserved Structured OSV record; GitHub-reviewed advisory.

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2026-50524: 1.23% estimated exploitation activity in the next 30 days; percentile 69.01 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET TLS/SSL (System.Net.Security). 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 .NET 8, .NET 9, and .NET 10 when processing TLS handshakes. An attacker can send a malformed request and cause application to crash or become unresponsive.

Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/413

CVSS Details - Version: 3.1 - Severity: High - 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` - Weakness: CWE-1287 (Improper Validation of Specified Type of Input)

Affected Platforms - Platforms: All - Architectures: All

Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from osv record GHSA-w7cw-xp7h-6j5j

  2. Revision 2 · amended ·

    Amended from ghsa record GHSA-w7cw-xp7h-6j5j

  3. Revision 1 · created ·

    Published from ghsa record GHSA-w7cw-xp7h-6j5j

Agent brief

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# Patch Next advisory brief: CVE-2026-50524

Advisory: Microsoft Security Advisory CVE-2026-50524 – .NET Denial of Service Vulnerability
IDs: CVE-2026-50524, GHSA-w7cw-xp7h-6j5j
Record: https://patchnext.com/advisories/cve-2026-50524 (revision 3, source checked 4 Nov 2026, 06:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: microsoft.netcore.app.runtime.win-x86 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.win-arm64 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.linux-musl-x64 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.linux-arm64 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.linux-arm 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.osx-x64 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.linux-x64 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.osx-arm64 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.linux-musl-arm 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.win-arm 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.linux-musl-arm64 10.0.10, 9.0.18, 8.0.29; microsoft.netcore.app.runtime.win-x64 10.0.10, 9.0.18, 8.0.29. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet microsoft.netcore.app.runtime.win-x86: affected >= 10.0.0, < 10.0.10; >= 9.0.0, < 9.0.18; >= 8.0.0, < 8.0.29; fixed in 8.0.29, 10.0.10, 9.0.18
- NuGet microsoft.netcore.app.runtime.win-arm64: affected >= 10.0.0, < 10.0.10; >= 9.0.0, < 9.0.18; >= 8.0.0, < 8.0.29; fixed in 8.0.29, 10.0.10, 9.0.18
- NuGet microsoft.netcore.app.runtime.linux-musl-x64: affected >= 10.0.0, < 10.0.10; >= 9.0.0, < 9.0.18; >= 8.0.0, < 8.0.29; fixed in 8.0.29, 10.0.10, 9.0.18
- NuGet microsoft.netcore.app.runtime.linux-arm64: affected >= 10.0.0, < 10.0.10; >= 9.0.0, < 9.0.18; >= 8.0.0, < 8.0.29; fixed in 8.0.29, 10.0.10, 9.0.18
- NuGet microsoft.netcore.app.runtime.linux-arm: affected >= 10.0.0, < 10.0.10; >= 9.0.0, < 9.0.18; >= 8.0.0, < 8.0.29; fixed in 8.0.29, 10.0.10, 9.0.18
- NuGet microsoft.netcore.app.runtime.osx-x64: affected >= 10.0.0, < 10.0.10; >= 9.0.0, < 9.0.18; >= 8.0.0, < 8.0.29; fixed in 8.0.29, 10.0.10, 9.0.18
- NuGet microsoft.netcore.app.runtime.linux-x64: affected >= 10.0.0, < 10.0.10; >= 9.0.0, < 9.0.18; >= 8.0.0, < 8.0.29; fixed in 8.0.29, 10.0.10, 9.0.18
- NuGet microsoft.netcore.app.runtime.osx-arm64: affected >= 10.0.0, < 10.0.10; >= 9.0.0, < 9.0.18; >= 8.0.0, < 8.0.29; fixed in 8.0.29, 10.0.10, 9.0.18
- NuGet microsoft.netcore.app.runtime.linux-musl-arm: affected >= 10.0.0, < 10.0.10; >= 9.0.0, < 9.0.18; >= 8.0.0, < 8.0.29; fixed in 8.0.29, 10.0.10, 9.0.18
- NuGet microsoft.netcore.app.runtime.win-arm: affected >= 10.0.0, < 10.0.10; >= 9.0.0, < 9.0.18; >= 8.0.0, < 8.0.29; fixed in 8.0.29, 10.0.10, 9.0.18
- NuGet microsoft.netcore.app.runtime.linux-musl-arm64: affected >= 10.0.0, < 10.0.10; >= 9.0.0, < 9.0.18; >= 8.0.0, < 8.0.29; fixed in 8.0.29, 10.0.10, 9.0.18
- NuGet microsoft.netcore.app.runtime.win-x64: affected >= 10.0.0, < 10.0.10; >= 9.0.0, < 9.0.18; >= 8.0.0, < 8.0.29; fixed in 8.0.29, 10.0.10, 9.0.18

## Suggested inspection (read-only)
- NuGet microsoft.netcore.app.runtime.win-x86: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.win-arm64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.linux-musl-x64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.linux-arm64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.linux-arm: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.osx-x64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.linux-x64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.osx-arm64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.linux-musl-arm: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.win-arm: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.linux-musl-arm64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.win-x64: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on microsoft.netcore.app.runtime.win-x86, microsoft.netcore.app.runtime.win-arm64, microsoft.netcore.app.runtime.linux-musl-x64, microsoft.netcore.app.runtime.linux-arm64, microsoft.netcore.app.runtime.linux-arm, microsoft.netcore.app.runtime.osx-x64, microsoft.netcore.app.runtime.linux-x64, microsoft.netcore.app.runtime.osx-arm64, microsoft.netcore.app.runtime.linux-musl-arm, microsoft.netcore.app.runtime.win-arm, microsoft.netcore.app.runtime.linux-musl-arm64, microsoft.netcore.app.runtime.win-x64.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-w7cw-xp7h-6j5j (GitHub-reviewed advisory GHSA-w7cw-xp7h-6j5j lists affected ranges: NuGet microsoft.netcore.app.runtime.linux-arm >=10.0.0 =9.0.0 =8.0.0 =10.0.0 =9.0.0 =8.0.0 =10.0.0 =9.0.0 =8.0.0 =10.0.0 =9.0.0 =8.0.0 <=8.0.28; NuGet…)
- Verified: https://osv.dev/vulnerability/GHSA-w7cw-xp7h-6j5j (OSV record GHSA-w7cw-xp7h-6j5j lists affected ranges: NuGet microsoft.netcore.app.runtime.linux-arm >=10.0.0 =9.0.0 =8.0.0 =10.0.0 =9.0.0 =8.0.0 =10.0.0 =9.0.0 =8.0.0 =10.0.0…)

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