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Valkey CVE-2026-27623

HIGH
Improper Input Validation (CWE-20)
2026-02-23 security-advisories@github.com
Denial Of Service Valkey Lfprojects
7.5
CVSS 3.1 · Vendor: github
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Send empty request to Valkey server
  2. Delivery
    Trigger networking state non-reset
  3. Exploit
    Send malformed follow-up request
  4. Execution
    Server assertion fails
  5. Impact
    Valkey process aborts

Vulnerability Assessment

Weakness
CWE
CWE-20
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Exploitation Conditions

Network access to Valkey versions 9.0.0 through 9.0.2 with default configuration. No authentication required. Works against any network-exposed Valkey instance without additional hardening.
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 flaw, the server shutting down.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Denial of service in Valkey 9.0.0 through 9.0.2 allows unauthenticated network attackers to crash the server by exploiting improper networking state handling after empty requests. An attacker can trigger an assertion failure that causes the Valkey process to abort, impacting availability for all users. No patch is currently available; network isolation is recommended as a mitigation.

Earlier versions of this analysis (1)
v1 Mar 12, 2026 - 21:55 CVSS 7.5

Valkey is a distributed key-value database. Starting in version 9.0.0 and prior to version 9.0.3, a malicious actor with network access to Valkey can cause the system to abort by triggering an assertion. [CVSS 7.5 HIGH]

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Technical ContextAI · show details

Classified as CWE-20 (Improper Input Validation). Affects Valkey. Valkey is a distributed key-value database. Starting in version 9.0.0 and prior to version 9.0.3, a malicious actor with network access to Valkey can cause the system to abort by triggering an assertion. When processing incoming requests, the Valkey system does not properly reset the networking state after processing an empty request. A malicious actor can then send a request that the server incorrectly identifies as breaking server side invariants, which results in the server shutting down. Ver

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Severity by source

Vendor (github) PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE HIGH
Red Hat 7.5 HIGH

Primary rating from Vendor (github).

CVSS VectorVendor: github

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Patch released
Apr 10, 2026 - 08:30 nvd
Patch available
CVE Published
Feb 23, 2026 - 20:28 nvd
HIGH 7.5

DescriptionCVE.org

Valkey is a distributed key-value database. Starting in version 9.0.0 and prior to version 9.0.3, a malicious actor with network access to Valkey can cause the system to abort by triggering an assertion. When processing incoming requests, the Valkey system does not properly reset the networking state after processing an empty request. A malicious actor can then send a request that the server incorrectly identifies as breaking server side invariants, which results in the server shutting down. Version 9.0.3 fixes the issue. As an additional mitigation, properly isolate Valkey deployments so that only trusted users have access.

Executive ViewAI

Why It Matters

A denial-of-service vulnerability in Valkey versions 9.0.0-9.0.2 allows remote attackers to crash the database service through a malicious network request, potentially disrupting applications and services dependent on this infrastructure. Organizations running affected Valkey versions in production environments face service availability risk, though exploitation requires network access and has low prevalence (0.1% EPSS).

Business Impact: Medium
Compensating Controls

Implement network segmentation and firewall rules to restrict Valkey port access to authorized clients only; deploy WAF/IDS rules to detect and block malformed Valkey protocol requests; configure monitoring and alerting on process crashes; establish automated failover and restart mechanisms; consider load balancing across multiple Valkey instances to distribute impact; maintain regular backups for rapid recovery.

Threat Intelligence Overview

EPSS Score
0.1%
Top 67% exploitable
Data Quality
6 sources
Confidence: High
NVD CVE.org EPSS MSRC Vendor 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.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
Medium

Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:lfprojects:valkey:*:*:*:*:*:*:*:*

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Same weakness CWE-20 – Improper Input Validation

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CVE-2009-0927 HIGH POC
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CVE-2017-9791 CRITICAL POC
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CVE-2017-15944 CRITICAL POC
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CVE-2019-0604 CRITICAL POC
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Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
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CVE-2011-2462 CRITICAL POC
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CVE-2011-0611 HIGH POC
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CVE-2012-1889 HIGH POC
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CVE-2012-0507 CRITICAL POC
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CVE-2014-1761 HIGH POC
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CVE-2015-5122 CRITICAL POC
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CVE-2011-0609 HIGH POC
7.8

Vendor StatusVendor

SUSE

Severity: High
Product Status
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

References

Advisories & patches
ADVISORY https://github.com/valkey-io/valkey/security/advisories/GHSA-93p9-5vc7-8wgr ADVISORY https://vuldb.com/vuln/347454 REF https://access.redhat.com/security/cve/CVE-2026-27623 REF https://bugzilla.redhat.com/show_bug.cgi?id=2442021 REF https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27623.json

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