CVE-2026-50524Network attack vector

Unauthenticated service interruption via malformed TLS handshake

Published Jul 14, 2026 · Updated Jul 14, 2026

Improper input validation in System.Net.Security in Microsoft .NET 8.0 through 10.0 allows remote attackers to crash or hang TLS applications. TLS handshake processing accepts a malformed request without validating the specified input type, causing the application to crash or become unresponsive. The affected application must expose TLS/SSL processing through a vulnerable runtime; exploitation requires no authentication or user interaction and affects availability only.

CVSS severity7.5
High
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in System.Net.Security in Microsoft .NET 8.0 through 10.0 allows remote attackers to crash or hang TLS applications. TLS handshake processing accepts a malformed request without validating the specified input type, causing the application to crash or become unresponsive. The affected application must expose TLS/SSL processing through a vulnerable runtime; exploitation requires no authentication or user interaction and affects availability only.

The record

CVE
CVE-2026-50524
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Microsoft
Product
.NET 9.0
Classifications
CWE-1287, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.0.0 <9.0.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · .NET 9.0version=9.0.0 <9.0.18
Microsoft · .NET 10.0version=10.0.0 <10.0.6
Microsoft · Microsoft Visual Studio 2022 version 17.12version=17.12.0 <17.12.22
Microsoft · Microsoft Visual Studio 2022 version 17.14version=17.14.0 <17.14.36
Microsoft · Microsoft Visual Studio 2026version=18.0 <18.7.4
Microsoft · .NET 8version=8.0.0 <8.0.29

Published CVSS scores

7.5MicrosoftCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1287Improper Validation of Specified Type of Input
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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