MSRC-CVE-2026-62898 — Microsoft QUIC Information Disclosure Vulnerability

Summary

Impact: Information Disclosure. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

What type of information could be disclosed by this vulnerability?
An attacker who successfully exploited this vulnerability could potentially read portions of process memory.

Security updates
10.0.11 — https://support.microsoft.com/help/5122106
9.0.19 — https://support.microsoft.com/help/5122105
8.0.30 — https://support.microsoft.com/help/5122104

Vulnerabilities 1

High 7.5

CVE-2026-62898

Microsoft QUIC Information Disclosure Vulnerability

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

Microsoft Microsoft Visual Studio 2022 version 17.14 .NET 9.0 runtime .NET 10.0 runtime Ubuntu Alpine NuGet

Aug 11, 2026

Revision history

2026-08-13 #2
Removed Linux and macOS products from the Affected Software table. This is an informational change only.
2026-08-11 #1
Information published.

References

CVE-2026-62898 Microsoft QUIC Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62898
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss