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CVE-2026-21863

7.5 · HIGH

Valkey is a distributed key-value database.

Published Feb 23, 2026CWE-125EPSS 0.79%

Overview

CVE-2026-21863 is a high-severity vulnerability. It was published on February 23, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/valkey-io/valkey/security/advisories/GHSA-c677-q3wr-gggqRefaccess.redhat.com/errata/RHSA-2026:3443Refaccess.redhat.com/errata/RHSA-2026:3507Refaccess.redhat.com/errata/RHSA-2026:5445Refaccess.redhat.com/errata/RHSA-2026:8753Refaccess.redhat.com/security/cve/CVE-2026-21863Refbugzilla.redhat.com/show_bug.cgi?id=2442026Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21863.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-21863?

CVE-2026-21863 is a high-severity vulnerability. It was published on February 23, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-21863?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-21863?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-21863?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-21863 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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