Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-27623— Valkey has Pre-Authentication DOS from malformed RESP request

Quick assessment

Affected
valkey-io valkey
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Valkey是Valkey开源的一个灵活的分布式键值数据库。 Valkey 9.0.0版本至9.0.3之前版本存在输入验证错误漏洞，该漏洞源于处理空请求后未正确重置网络状态，可能导致恶意请求触发断言使服务器关闭。

CVSS 7.5 · High EPSS 0.40% · P35

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
valkey-io valkey >= 9.0.0, < 9.0.3 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-27623

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Valkey has Pre-Authentication DOS from malformed RESP request
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Valkey 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Valkey是Valkey开源的一个灵活的分布式键值数据库。 Valkey 9.0.0版本至9.0.3之前版本存在输入验证错误漏洞，该漏洞源于处理空请求后未正确重置网络状态，可能导致恶意请求触发断言使服务器关闭。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
valkey-io valkey >= 9.0.0, < 9.0.3 -

II. Public POCs for CVE-2026-27623

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-27623

请登录查看更多情报信息。

Same Patch Batch · valkey-io · 2026-02-23 · 3 CVEs total

CVE-2025-67733 8.5 HIGH Valkey Affected by RESP Protocol Injection via Lua error_reply
CVE-2026-21863 7.5 HIGH Malformed Valkey Cluster bus message can lead to Remote DoS

IV. Related Vulnerabilities

Same product: valkey
Same vendor: valkey-io
Same weakness: CWE-20