CVE-2026-63075: QUIC ACK-only Packet Retention Can Cause Memory Exhaustion

Overview

Severity

High (CVSS 7.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Aug

Released

2026-08-27

EPSS Score

0.48% (percentile: 39.6%)

Affected Products (5)

Other

• 21500-17084
• 21716-17084
• 21734-17084
• 21655-17084
• 21761-17084

Revision History

• 2026-08-27: Information published.