Valkey Distributed Key-Value Database Vulnerability in Packet Processing
CVE-2026-21863

7.5HIGH

Key Information:

Vendor

Valkey-io

Status
Valkey
Vendor
CVE Published:
23 February 2026

What is CVE-2026-21863?

A vulnerability in Valkey, a distributed key-value database, could be exploited by an attacker with access to the clusterbus port. Without proper validation of clusterbus ping extension packets, an attacker may send malformed packets, leading to an outbound read operation that could crash the system. This issue affects versions before 9.0.2, 8.1.6, 8.0.7, and 7.2.12. To protect against this vulnerability, it is recommended to avoid exposing the clusterbus connection to end users and to implement protective network ACLs.

Affected Version(s)

valkey < 7.2.12 < 7.2.12

valkey >= 8.0.0, < 8.0.7 < 8.0.0, 8.0.7

valkey >= 8.1.0, < 8.1.6 < 8.1.0, 8.1.6

References

https://github.com/valkey-io/valkey/security/advisories/G...
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CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.