CVE-2026-21863
7.5 · HIGHOverview
CVE-2026-21863 is a high-severity vulnerability affecting lfprojects valkey. 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 and patches from lfprojects. Update valkey to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| lfprojects | valkey | >= 0, < 7.2.12 | Affected |
References
Frequently Asked Questions
What is CVE-2026-21863?
CVE-2026-21863 is a high-severity vulnerability affecting lfprojects valkey. 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 and patches from lfprojects. Update valkey to the latest patched version. 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's AI-powered security agents can automatically detect CVE-2026-21863 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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