Microsoft .NET/Visual Studio QUIC use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.0$5k-$25k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Microsoft .NET and Visual Studio. Affected by this issue is some unknown functionality of the component QUIC. The manipulation leads to use after free. This vulnerability is referenced as CVE-2026-62898. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Microsoft .NET and Visual Studio (affected version not known). It has been rated as critical. This issue affects some unknown functionality of the component QUIC. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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

The advisory is shared at msrc.microsoft.com. The identification of this vulnerability is CVE-2026-62898 since 07/14/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/20/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-56773) and CERT Bund (WID-SEC-2026-2761). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Microsoft PowerShell
  • Red Hat Enterprise Linux
  • Fedora Linux
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2022
  • Microsoft .NET Framework
  • Microsoft Visual Studio Code
  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2025
  • RESF Rocky Linux
  • Microsoft Windows
  • Microsoft .NET
  • Ubuntu Linux
  • Oracle Linux
  • Microsoft Visual Studio 2022
  • Microsoft Visual Studio 2026

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Timelineinfo

07/14/2026 CVE reserved
08/11/2026 +28 days Advisory disclosed
08/11/2026 +0 days VulDB entry created
08/20/2026 +9 days VulDB entry last update

Sourcesinfo

Vendor: microsoft.com

Advisory: msrc.microsoft.com
Status: Confirmed

CVE: CVE-2026-62898 (🔒)
GCVE (CVE): GCVE-0-2026-62898
GCVE (VulDB): GCVE-100-388565
EUVD: 🔒
CERT Bund: WID-SEC-2026-2761 - Microsoft Developer Tools: Mehrere Schwachstellen

Entryinfo

Created: 08/11/2026 22:24
Updated: 08/20/2026 05:51
Changes: 08/11/2026 22:24 (53), 08/12/2026 02:53 (1), 08/15/2026 02:18 (7), 08/20/2026 05:51 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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