ReviewHigh
CVE-2026-62898
Microsoft .NET 10.0, .NET 8.0, .NET 9.0
Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.
- CVSS
- 7.5
- EPSS
- - - percentile
- CISA KEV
- Not listed
- Published
- 2026.08.12
Review
The CVSS severity warrants an early asset and exposure review.
Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.5
Vulnerability overview
Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.
Affected product and versions
- Product
- Microsoft .NET 10.0, .NET 8.0, .NET 9.0
- Affected versions
- >= 10.0.0 < 10.0.11, >= 8.0.0 < 8.0.30, >= 9.0.0 < 9.0.19, >= 17.14.0 < 17.14.38, >= 18.0 < 18.8.3, >= 18.8.0 < 18.8.3
- Fixed versions
- Verify the fixed release separately for each affected product line
Recommended response sequence
Confirm exposure before applying a vendor-supported change.
- 1Identify
Confirm that Microsoft .NET 10.0, .NET 8.0, .NET 9.0 and an affected version are present.
- 2Prioritize
Combine exploitation signals with asset exposure and business criticality.
- 3Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
- 4Verify
Recheck the version, service health, access paths, and relevant logs.
Technical data
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CWE
- CWE-416