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Privacy Statement Third-Party Cookies AcceptRejectManage cookies MSRC  Customer Guidance  Security Update Guide  Vulnerabilities  CVE-2026-62898 Microsoft QUIC Information Disclosure Vulnerability New On this page  CVE-2026-62898  Subscribe RSS PowerShell  API  CSAF Security Vulnerability Released: Aug 11, 2026 Assigning CNA Microsoft CVE.org link CVE-2026-62898  Impact Information Disclosure Max Severity Important Weakness CWE-416: Use After Free CVSS Source Microsoft Vector String 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 Metrics CVSS:3.1 7.5 / 6.5  Base score metrics: 7.5 / Temporal score metrics: 6.5  Expand all  Collapse all Metric Value   Base score metrics(8) Attack Vector Network Attack Complexity Low Privileges Required None User Interaction None Scope Unchanged Confidentiality High Integrity None Availability None   Temporal score metrics(3) Exploit Code Maturity Unproven Remediation Level Official Fix Report Confidence Confirmed Please see Common Vulnerability Scoring System for more information on the definition of these metrics. Executive Summary Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network. Exploitability The following table provides an exploitability assessment for this vulnerability at the time of original publication. Publicly disclosed No Exploited No Exploitability assessment Exploitation Less Likely FAQ What type of information could be disclosed by this vulnerability? An attacker who successfully exploited this vulnerability could potentially read portions of process memory. Acknowledgements Quac Tran Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information. Security Updates To determine the support lifecycle for your software, see the Microsoft Support Lifecycle. Release date Descending  Edit columns  Download  Filters  Product Family  Max Severity  Impact  Platform   Clear Release date  Product Platform Impact Max Severity Article Download Build Number Assigning CNA Title: Release date, Content: Aug 11, 2026 .NET 9.0 installed on Mac OS - Information Disclosure Important Title: Knowledge Base Articles for .NET 9.0 installed on Mac OS, Content:, 1 link 5122105  Title: Download Security Update for .NET 9.0 installed on Mac OS, Content:, 1 link Security Update  Title: Build numbers, Content: 9.0.19 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 .NET 8.0 installed on Linux - Information Disclosure Important Title: Knowledge Base Articles for .NET 8.0 installed on Linux, Content:, 1 link 5122104  Title: Download Security Update for .NET 8.0 installed on Linux, Content:, 1 link Security Update  Title: Build numbers, Content: 8.0.30 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 .NET 8.0 installed on Mac OS - Information Disclosure Important Title: Knowledge Base Articles for .NET 8.0 installed on Mac OS, Content:, 1 link 5122104  Title: Download Security Update for .NET 8.0 installed on Mac OS, Content:, 1 link Security Update  Title: Build numbers, Content: 8.0.30 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 .NET 8.0 installed on Windows - Information Disclosure Important Title: Knowledge Base Articles for .NET 8.0 installed on Windows, Content:, 1 link 5122104  Title: Download Security Update for .NET 8.0 installed on Windows, Content:, 1 link Security Update  Title: Build numbers, Content: 8.0.30 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 .NET 9.0 installed on Windows - Information Disclosure Important Title: Knowledge Base Articles for .NET 9.0 installed on Windows, Content:, 1 link 5122105  Title: Download Security Update for .NET 9.0 installed on Windows, Content:, 1 link Security Update  Title: Build numbers, Content: 9.0.19 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 .NET 9.0 installed on Linux - Information Disclosure Important Title: Knowledge Base Articles for .NET 9.0 installed on Linux, Content:, 1 link 5122105  Title: Download Security Update for .NET 9.0 installed on Linux, Content:, 1 link Security Update  Title: Build numbers, Content: 9.0.19 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Microsoft Visual Studio 2026 version 18.8 - Information Disclosure Important Title: Knowledge Base Articles for Microsoft Visual Studio 2026 version 18.8, Content:, 1 link - Title: Download Security Update for Microsoft Visual Studio 2026 version 18.8, Content:, 1 link Security Update Title: Build numbers, Content: 18.8.3 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Microsoft Visual Studio 2022 version 17.14 - Information Disclosure Important Title: Knowledge Base Articles for Microsoft Visual Studio 2022 version 17.14, Content:, 1 link - Title: Download Security Update for Microsoft Visual Studio 2022 version 17.14, Content:, 1 link Security Update Title: Build numbers, Content: 17.14.38 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 .NET 10.0 installed on Linux - Information Disclosure Important Title: Knowledge Base Articles for .NET 10.0 installed on Linux, Content:, 1 link 5122106  Title: Download Security Update for .NET 10.0 installed on Linux, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.11 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 .NET 10.0 installed on Windows - Information Disclosure Important Title: Knowledge Base Articles for .NET 10.0 installed on Windows, Content:, 1 link 5122106  Title: Download Security Update for .NET 10.0 installed on Windows, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.11 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 .NET 10.0 installed on Mac OS - Information Disclosure Important Title: Knowledge Base Articles for .NET 10.0 installed on Mac OS, Content:, 1 link 5122106  Title: Download Security Update for .NET 10.0 installed on Mac OS, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.11 Title: Assigning CNA, Content: Microsoft All results loaded Loaded all 11 rows Disclaimer The information provided in the Microsoft Knowledge Base 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. Revisions version revisionDate description 1.0 Aug 11, 2026 Information published.  How satisfied are you with the MSRC Security Update Guide? Rating  Broken  Bad  Below average  Average  Great!  Your Privacy Choices Consumer Health Privacy Privacy & Cookies