Skip to main content
← All vulnerabilities
CVE-2026-21863

Malformed Valkey Cluster bus message can lead to Remote DoS

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 7.2.12, 8.0.7, 8.1.6, 9.0.2
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

Valkey is a distributed key-value database. Prior to versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12, a malicious actor with access to the Valkey clusterbus port can send an invalid packet that may cause an out bound read, which might result in the system crashing. The Valkey clusterbus packet processing code does not validate that a clusterbus ping extension packet is located within buffer of the clusterbus packet before attempting to read it. Versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12 fix the issue. As an additional mitigation, don't expose the cluster bus connection directly to end users, and protect the connection with its own network ACLs.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • valkey-io valkey

    fixed in 7.2.12; From 8.0.0 · fixed in 8.0.7; From 8.1.0 · fixed in 8.1.6; From 9.0.0 · fixed in 9.0.2

References 1

GitHub · valkey-io/valkey