Vulnerability-Lookup

CVE-2026-62898 (GCVE-0-2026-62898)

Vulnerability from cvelistv5 – Published: 2026-08-11 17:07 – Updated: 2026-08-11 22:01

Title

Microsoft QUIC Information Disclosure Vulnerability

Summary

Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

microsoft

References

1 reference

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch

Impacted products

5 products

Vendor	Product	Version
Microsoft	.NET 10.0	Affected: 10.0.0 , < 10.0.11 (custom)
Microsoft	.NET 8.0	Affected: 8.0.0 , < 8.0.30 (custom)
Microsoft	.NET 9.0	Affected: 9.0.0 , < 9.0.19 (custom)
Microsoft	Microsoft Visual Studio 2022 version 17.14	Affected: 17.14.0 , < 17.14.38 (custom)
Microsoft	Microsoft Visual Studio 2026 version 18.8	Affected: 18.0 , < 18.8.3 (custom)

Date Public

2026-08-11 14:00

Show details on NVD website

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GHSA-C494-M2FQ-59MX

Vulnerability from github – Published: 2026-08-11 18:28 – Updated: 2026-08-11 18:34

Summary

Microsoft Security Advisory CVE-2026-62898 – .NET Information Disclosure Vulnerability

Details

Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft QUIC. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/426

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:H/I:N/A:N/E:U/RL:O/RC:C
Weakness: CWE-416: Use After Free

Affected Platforms

Platforms: Windows
Architectures: All

Affected Packages

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

.NET 10

Package name	Affected version	Patched version
Microsoft.NETCore.App.Runtime.win-arm64	>= 10.0.0, <= 10.0.10	10.0.11
Microsoft.NETCore.App.Runtime.win-x64	>= 10.0.0, <= 10.0.10	10.0.11
Microsoft.NETCore.App.Runtime.win-x86	>= 10.0.0, <= 10.0.10	10.0.11

.NET 9

Package name	Affected version	Patched version
Microsoft.NETCore.App.Runtime.win-arm64	>= 9.0.0, <= 9.0.18	9.0.19
Microsoft.NETCore.App.Runtime.win-x64	>= 9.0.0, <= 9.0.18	9.0.19
Microsoft.NETCore.App.Runtime.win-x86	>= 9.0.0, <= 9.0.18	9.0.19

.NET 8

Package name	Affected version	Patched version
Microsoft.NETCore.App.Runtime.win-arm64	>= 8.0.0, <= 8.0.29	8.0.30
Microsoft.NETCore.App.Runtime.win-x64	>= 8.0.0, <= 8.0.29	8.0.30
Microsoft.NETCore.App.Runtime.win-x86	>= 8.0.0, <= 8.0.29	8.0.30

Advisory FAQ

How do I know if I am affected?

If using a package listed in affected packages, an application is exposed to the vulnerability.

How do I fix the issue?

To fix the issue please install the latest version of .NET. If an application has installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt a user to update Visual Studio, which will also update their .NET SDKs.
If an application references the vulnerable package, update the package reference to the patched version. Users can list the versions they have installed by running the dotnet --info command.

Once users have installed the updated runtime or SDK, they need to restart their apps for the update to take effect.

Additionally, if users have deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.

Other Information

Reporting Security Issues

If users have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ.

Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.

Support

Users can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. Users can ask questions in the linked discussion issue.

Disclaimer

The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

External Links

CVE-2026-62898

Revisions

V1.0 (08/11/2026): Advisory published.