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Vulnerabilities CVE-2026-27623

CVE-2026-27623

High
Open
TLP:CLEAR

Valkey has Pre-Authentication DOS from malformed RESP request

NVD CVE.org
Critical Infrastructure

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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.

Details

CVSS Score
7.5
EPSS Score
0.35%

28.2th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Feb 23, 2026
Last Modified
Jul 15, 2026
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