CVE-2026-27623 — Improper Input Validation in Valkey

CWE-20 — Improper Input ValidationCWE-617 — Reachable Assertion6 documents6 sources
Severity
7.5HIGHNVD
EPSS
0.1%
top 64.75%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Lfprojects ValkeyValkey-io ValkeyDebian Valkey+1 more
Timeline
PublishedFeb 23

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. Ver…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages5 packages

▶NVDlfprojects/valkey9.0.0 — 9.0.3
▶Alpinelfprojects/valkey< 9.0.3-r0
▶debiandebian/valkey
▶CVEListV5valkey-io/valkey>= 9.0.0, < 9.0.3

🔴Vulnerability Details

1
OSV
CVE-2026-27623: Valkey is a distributed key-value database↗2026-02-23
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📋Vendor Advisories

3
Red Hat
Valkey: Valkey: Denial of Service via specially crafted network requests↗2026-02-23
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Microsoft
Valkey has Pre-Authentication DOS from malformed RESP request↗2026-02-10
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Debian
CVE-2026-27623: valkey - Valkey is a distributed key-value database. Starting in version 9.0.0 and prior ...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-27623 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-27623 — Improper Input Validation in Valkey | cvebase