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CVE

CVE-2026-27623

Valkey has Pre-Authentication DOS from malformed RESP request
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CVE

CVE-2026-27623

Valkey has Pre-Authentication DOS from malformed RESP request

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27623.json, https://github.com/valkey-io/valkey/security/advisories/GHSA-93p9-5vc7-8wgr, https://nvd.nist.gov/vuln/detail/CVE-2026-27623

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.00127%
EPSS Percentile
0.31487%
Introduced Version
5018b12b0de2d2322a1bbf6b041c43740587c0f2,9.0.0,0
Fix Available
6e63ad9ccdceea562a6ea9ea9df9160c0d1109d6,9.0.3,9.0.3-r0

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