CVE tracker / CVE-2026-62898
CVE-2026-62898
CVE-2026-62898 is the Microsoft QUIC Information Disclosure Vulnerability. Microsoft rates it Important, CVSS 7.5. It is not in CISA's Known Exploited Vulnerabilities catalog. Published August 11, 2026.
Risk summary
HighInformation Disclosure
7.5
CVSS v3 base
1.0%
EPSS: chance of exploitation in 30 days
High
Severity
Important
Microsoft's rating
Less Likely
Microsoft: exploitation
No
In CISA KEV
Microsoft describes it: “Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.”
How to fix it
Microsoft lists 5 affected products and the update that fixes each:
- KB5122104 · fixed build 8.0.30
.NET 8.0 runtime installed on Windows - KB5122105 · fixed build 9.0.19
.NET 9.0 runtime installed on Windows - KB5122106 · fixed build 10.0.11
.NET 10.0 runtime installed on Windows - No update listed · fixed build 17.14.38
Microsoft Visual Studio 2022 version 17.14 - No update listed · fixed build 18.8.3
Microsoft Visual Studio 2026 version 18.8
What Microsoft changed
- August 13, 2026: Removed Linux and macOS products from the Affected Software table. This is an informational change only.
- August 11, 2026: Information published.
Details
- Weakness
- CWE-416: Use After Free
- Publicly disclosed (Microsoft)
- No
- Exploited (Microsoft)
- No
- Known exploited (CISA KEV)
- Not listed
- Published
- August 11, 2026
- Last revised
- August 13, 2026
Get told when this changes
Senserva Watch emails Microsoft security and patch alerts when something moves: a new exploitation report, a revised fix, a known issue. Free, one email address.
References
From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.