Use-after-free in Valkey - CVE-2026-63639
Published: July 22, 2026
Vulnerability identifier: #VU139071
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-63639
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Valkey
Affected software:
Valkey
Valkey
Detailed vulnerability description
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in stream deserialization. A remote user can use a specially crafted RESTORE command and execute arbitrary code on the target system.
How to mitigate CVE-2026-63639
Install updates from vendor's website.