CVE-2026-63639: Valkey: UAF in stream deserialization may lead to remote code execution

Overview

Severity

High (CVSS 8.8)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Aug

Released

2026-08-21

EPSS Score

1.17% (percentile: 65.0%)

Affected Products (1)

Other

• 21628-17084

Revision History

• 2026-08-21: Information published.