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Out-of-bounds Read The advisory has been revoked - it doesn't affect any version of package valkey-devel  (opens in a new tab)

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EPSS
0.85% (58th percentile)

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  • Snyk IDSNYK-RHEL10-VALKEYDEVEL-15340060
  • published25 Feb 2026
  • disclosed23 Feb 2026
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Introduced: 23 Feb 2026

CVE-2026-21863  (opens in a new tab)
CWE-125  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream valkey-devel package and not the valkey-devel package as distributed by RHEL.

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.