Valkey
CVE-2026-21863
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessAccess Valkey clusterbus port
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ExploitSend invalid ping extension packet
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ExecutionTrigger out-of-bounds read
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ImpactSystem crash
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Bounds checking, read limits
MITRE ATT&CK
1 technique across 1 tactic: Collection The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Unauthenticated network access to Valkey clusterbus port (default 16379 or configured port). No special conditions required—remote unauthenticated attacker can exploit vulnerable Valkey versions (prior to 9.0.2, 8.1.6, 8.0.7, 7.2.12) with direct clusterbus exposure. |
| Impact | CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitable via remote/network. |
| Exploit ScenarioDerived | A remote attacker could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Out-of-bounds read in Valkey clusterbus port processing allows network-adjacent attackers to crash affected systems by sending specially crafted packets that bypass buffer validation checks. This vulnerability affects Valkey versions prior to 9.0.2, 8.1.6, 8.0.7, and 7.2.12, impacting any deployment exposing the clusterbus port to untrusted networks. Patches are available and administrators should restrict clusterbus access with network ACLs as an immediate mitigation.
Earlier versions of this analysis (1)
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. [CVSS 7.5 HIGH]
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-125 (Out-of-bounds Read). Affects Valkey. 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
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (github).
CVSS VectorVendor: github
Lifecycle Timeline
2DescriptionCVE.org
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.
Executive ViewAI
Valkey distributed databases running versions prior to 9.0.2, 8.1.6, 8.0.7, and 7.2.12 are vulnerable to denial-of-service attacks through maliciously crafted packets on the cluster communication port. An attacker with network access to the clusterbus port can crash affected systems, resulting in service unavailability and potential data access disruptions.
Restrict network access to Valkey clusterbus ports using firewall rules and security groups, allowing only known cluster nodes and administrative systems; implement rate limiting and packet validation at network boundary; disable cluster mode if not required for business operations; monitor clusterbus port for suspicious connection attempts and invalid packet patterns; maintain current backups and disaster recovery procedures to enable rapid service restoration if systems are compromised.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
Affected Products (CPE)CVE.org
UAF in Redis 8.2.1 via crafted Lua scripts by authenticated users. EPSS 12.4%. Patch available.
Out-of-bounds read in Valkey's cluster slot-migration RDB loader allows a network-positioned attacker to crash affected
Use-after-free in Valkey's RESTORE command allows a low-privileged remote attacker to potentially execute arbitrary code
Use-after-free in Valkey's TLS connection handler allows an authenticated remote attacker to crash the server or potenti
Redis is an open source, in-memory database that persists on disk. Rated high severity (CVSS 7.5), this vulnerability is
Denial of service in Valkey 9.0.0 through 9.0.2 allows unauthenticated network attackers to crash the server by exploiti
Response-stream injection in Valkey (the Redis fork) lets an authenticated user abuse Lua scripting commands to smuggle
Double-free memory corruption in Valkey 9.1.0's Module Timer Subsystem allows a high-privileged remote attacker to crash
Out-of-bounds read in Valkey's `kvstoreGetHashtable` function (src/kvstore.c) allows an attacker who can supply a crafte
Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
View allVendor StatusVendor
SUSE
Severity: High| Product | Status |
|---|---|
| SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Server Applications 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 | Fixed |
| openSUSE Leap 15.6 | Fixed |
| openSUSE Tumbleweed | Fixed |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | Fixed |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | Fixed |
| SUSE Linux Enterprise Server 15 SP7 | Fixed |
| SUSE Linux Enterprise Server 16.0 | Fixed |
| SUSE Linux Enterprise Server 16.1 | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | Fixed |
| SUSE Linux Enterprise Server for SAP applications 16.0 | Fixed |
| SUSE Linux Enterprise Server for SAP applications 16.1 | Fixed |
| openSUSE Leap 15.6 | Fixed |
| SUSE Linux Enterprise Module for Server Applications 15 SP6 | Fixed |
| SUSE Linux Enterprise Server 15 SP6 | Fixed |
| SUSE Linux Enterprise Server 15 SP6-LTSS | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | Fixed |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | Fixed |
| private-registry/harbor-valkey suse/valkey | Fixed |
Exploit-DB