1. Home
  2. Vulnerabilities
  3. CVE-2026-62815
9.8
CRITICAL CVSS 3.1
CVE-2026-62815
Microsoft QUIC Remote Code Execution Vulnerability
Overview
Description

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

Details
INFO

Published Date :

Aug. 11, 2026, 5:18 p.m.

Last Modified :

Aug. 12, 2026, 5:18 a.m.

Remotely Exploit :

No

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-62815 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Microsoft windows_server_2022
2 Microsoft windows_11
3 Microsoft windows_11_23h2
4 Microsoft windows_11_24h2
5 Microsoft windows_server_2025
6 Microsoft windows_11_25h2
7 Microsoft windows_11_26h1
: Total Affected Vendor : 1 | Products : 7
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 CRITICAL f38d906d-7342-40ea-92c1-6c4a2c6478c8
CVSS 3.1 CRITICAL [email protected]
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-62815.

URL Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-62815 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-62815 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-62815 vulnerability anywhere in the article.

  • CrowdStrike.com
August 2026 Patch Tuesday: One Exploited Zero-Day and 62 Critical Vulnerabilities Among 415 CVEs

Microsoft has addressed 415 vulnerabilities in its August 2026 security update release. This month's patches include fixes for one exploited zero-day vulnerability, three disclosed zero-day vulnerabil ... Read more

Published Date: Aug 12, 2026 (5 hours, 3 minutes ago)
  • TheCyberThrone
Microsoft Patch Tuesday August 2026

Microsoft’s August 2026 Patch Tuesday is another substantial  security release, addressing 421 vulnerabilities across Windows, Office, Azure, Exchange Server, SharePoint Server, developer tooling and ... Read more

Published Date: Aug 12, 2026 (9 hours, 12 minutes ago)
  • The Hacker News
Microsoft Patches 398 Flaws Including a Windows Driver Zero-Day Under Active Attack

Microsoft released its monthly security updates on Tuesday, and one of the flaws it closed is already being used in attacks. The bug sits in a core Windows kernel driver that handles network socket op ... Read more

Published Date: Aug 11, 2026 (13 hours, 58 minutes ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-62815 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 12, 2026

    Action Type Old Value New Value
    Changed SSVC {'id': 'CVE-2026-62815', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-11T19:58:34.901364Z'} {'id': 'CVE-2026-62815', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-10T00:00:00+00:00'}
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 11, 2026

    Action Type Old Value New Value
    Added SSVC {'id': 'CVE-2026-62815', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-11T19:58:34.901364Z'}
  • New CVE Received by [email protected]

    Aug. 11, 2026

    Action Type Old Value New Value
    Added Affected [{'vendor': 'Microsoft', 'product': 'Windows 11 version 23H2', 'versions': [{'status': 'affected', 'version': '10.0.22631.0', 'lessThan': '10.0.22631.7517', 'versionType': 'custom'}], 'platforms': ['ARM64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows 11 Version 23H2', 'versions': [{'status': 'affected', 'version': '10.0.22631.0', 'lessThan': '10.0.22631.7517', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows 11 Version 24H2', 'versions': [{'status': 'affected', 'version': '10.0.26100.0', 'lessThan': '10.0.26100.9168', 'versionType': 'custom'}], 'platforms': ['ARM64-based Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows 11 Version 25H2', 'versions': [{'status': 'affected', 'version': '10.0.26200.0', 'lessThan': '10.0.26200.9168', 'versionType': 'custom'}], 'platforms': ['ARM64-based Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows 11 version 26H1', 'versions': [{'status': 'affected', 'version': '10.0.28000.0', 'lessThan': '10.0.28000.2704', 'versionType': 'custom'}], 'platforms': ['ARM64-based Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2022', 'versions': [{'status': 'affected', 'version': '10.0.20348.0', 'lessThan': '10.0.20348.5499', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2025', 'versions': [{'status': 'affected', 'version': '10.0.26100.0', 'lessThan': '10.0.26100.33296', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2025 (Server Core installation)', 'versions': [{'status': 'affected', 'version': '10.0.26100.0', 'lessThan': '10.0.26100.33296', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}]
    Added Description Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-416
    Added Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 9.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact