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7.5 High

CVE-2026-21863 Valkey is a distributed key-value database

Description

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.

Affected products and versions

Product Affected versions Fixed in
Red Hat Enterprise Linux AppStream EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux AppStream (v. 10) Versions not published
Red Hat Enterprise Linux AppStream (v. 9) Versions not published
Red Hat Hardened Images 9.0 earliest → < 9.0.3-1.2.hum1 9.0.3-1.2.hum1
valkey 9.0 9.0.0 → < 9.0.2 9.0.2
valkey 8.1 8.1.0 → < 8.1.6 8.1.6
valkey 8.0 8.0.0 → < 8.0.7 8.0.7
valkey 7.2 earliest → < 7.2.12 7.2.12
Red Hat Enterprise Linux 10 Versions not published
Show the 2 other branches
Product Affected versions Fixed in
Red Hat Enterprise Linux 10.0 Extended Update Support Versions not published
Red Hat Enterprise Linux 9 Versions not published

References

Timeline

  1. Published
  2. Last modified

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