---
cve: "CVE-2026-56684"
severity: "HIGH"
cvss: 7.5
epss: "52%"
vendor: "valkey-io"
kev: false
exploited: false
published: "2026-08-18 15:16:55"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T17:29:54+02:00"
---

# CVE-2026-56684

> 7.5 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 499cfb9431c7cebec4d91f81bb4932a742a8c8ae (Commit)
- 23b3f6bb66c19502225a40e7aeec9e1be76456c1 (Commit)

## Referenzen

- <https://github.com/valkey-io/valkey/security/advisories/GHSA-53mc-f3m3-99vh>
- <https://github.com/valkey-io/valkey/pull/4234>
- <https://github.com/valkey-io/valkey/commit/7cd5bcb7575d750ec2de618db80da58680a10fe3>
- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-56684) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_