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Vulnerability record · CVE-2026-27623 · published 23 February 2026

CVE-2026-27623: Lfprojects valkey improper input validation vulnerability

Lfprojects · 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. Version 9.0.3 fixes the issue. As an additional mitigation, properly isolate Valkey deployments so that only trusted users have access.

7.5 CVSS 3.1 High EPSS 0.65% · top 50.7% CWE-20 · Improper input validationCWE-617 · CWE-617
7.5CVSS 3.1 base score
0.65%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
15 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/valkey-io/valkey/security/advisories/GHSA-93p9-5vc7-8wgr Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-27623
https://bugzilla.redhat.com/show_bug.cgi?id=2442021
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27623.json

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Source: NIST National Vulnerability Database (record CVE-2026-27623), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.