Input validation error in Valkey - CVE-2026-27623
Published: April 27, 2026
Vulnerability identifier: #VU128027
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-27623
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in the request processing logic when handling malformed RESP requests after an empty request. A remote attacker can send a specially crafted request to cause a denial of service.
The issue can trigger an assertion failure that causes the server to abort and shut down.
Affected software
Valkey
Fedora
valkey
Fedora
valkey
How to mitigate CVE-2026-27623
Install security update from vendor's website.
Valkey - update to 9.0.3
valkey - update to 9.0.3-1.fc44
valkey - update to 9.0.3-1.fc44