CVE-2026-27623

A flaw was found in Valkey. A malicious actor with network access to Valkey can cause the system to shut down by sending a specially crafted request. This occurs because the system does not properly reset its networking state after processing an empty request, leading to an assertion failure. This vulnerability results in a Denial of Service (DoS), making the Valkey database unavailable.

This is an IMPORTANT denial-of-service vulnerability in Valkey versions 9.0.0 through 9.0.2. A remote, unauthenticated attacker with network access to a Valkey instance can send a malformed request, causing the server to terminate due to an assertion failure. This issue arises from improper state handling after processing an empty request.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.