Vulnerability Description
Valkey is a distributed key-value database. Prior to 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1, Valkey's tlsProcessPendingData function iterates pending_list while an authenticated client can trigger CLIENT KILL, causing connTLSClose to delete the iterator's cached next node and producing a use-after-free that can crash the server or potentially allow remote code execution when TLS is enabled. This issue is fixed in versions 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/valkey-io/valkey/commit/7cd5bcb7575d750ec2de618db80da58680a10
- https://github.com/valkey-io/valkey/pull/4234
- https://github.com/valkey-io/valkey/releases/tag/7.2.14
- https://github.com/valkey-io/valkey/releases/tag/8.0.10
- https://github.com/valkey-io/valkey/releases/tag/8.1.9
- https://github.com/valkey-io/valkey/releases/tag/9.0.5
- https://github.com/valkey-io/valkey/releases/tag/9.1.1
- https://github.com/valkey-io/valkey/security/advisories/GHSA-53mc-f3m3-99vh
FAQ
What is CVE-2026-56684?
CVE-2026-56684 is a vulnerability with a CVSS score of 7.5 (HIGH). Valkey is a distributed key-value database. Prior to 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1, Valkey's tlsProcessPendingData function iterates pending_list while an authenticated client can trigger CL...
How severe is CVE-2026-56684?
CVE-2026-56684 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56684?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.