CVE Tools
Sign in

CVE-2026-27623

Valkey has Pre-Authentication DOS from malformed RESP request

Published: Feb 23, 2026Updated: Jul 15, 2026 Sources: CVE List NVD BDUCWE-20
7.5HIGH
NVD MITRE
EPSS Score
0.4%
Top 71.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-20CWE-617

Affected Products

valkey-io
oss-projectaka valkey-bloom, valkey
valkeyOn-prem
Databases / cache-message-queue
lfprojects
oss-projectaka model context protocol servers, mlflow, valkey, mcp servers
valkey
Databases / nosql
ООО «Ред Софт»
commercial·RUaka red soft
РЕД ОСOn-premOS
Operating Systems / linux-distro
Сообщество свободного программного обеспечения
oss-projectaka fsf
ValkeyOn-premDatabase
Databases / nosql

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-27623?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

https://github.com/valkey-io/valkey/security/advisories/GHSA-93p9-5vc7-8wgr
github.com
https://access.redhat.com/security/cve/CVE-2026-27623
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2442021
bugzilla.redhat.com
and 3 more references View all →

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-27623 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows