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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.

PUBLISHED Reserved 2026-01-05 | Published 2026-02-23 | Updated 2026-02-23 | Assigner GitHub_M




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-125: Out-of-bounds Read

Product status

< 7.2.12
affected

>= 8.0.0, < 8.0.7
affected

>= 8.1.0, < 8.1.6
affected

>= 9.0.0, < 9.0.2
affected

References

github.com/...valkey/security/advisories/GHSA-c677-q3wr-gggq

cve.org (CVE-2026-21863)

nvd.nist.gov (CVE-2026-21863)

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