CVE-2026-56684
Published: August 20, 2026Last modified: August 21, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack Vector | NETWORK |
| Attack complexity | HIGH |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | redis | Vulnerable (7.0.9-r0) |
| 25 LTS | valkey | Vulnerable (8.1.6-r0) | |
| Stream | valkey | Vulnerable (9.0.3-r0) |
References
- https://github.com/valkey-io/valkey/commit/7cd5bcb7575d750ec2de618db80da58680a10fe3
- 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