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OpenAdvisories
High · 7.5 CVE-2026-27623 EUVD-2026-7509

Valkey has Pre-Authentication DOS from malformed RESP request

Published Feb 23, 2026 · Updated Jul 15, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
valkey-io valkey >= 9.0.0, < 9.0.3 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
openSUSE Tumbleweed valkey 9.0.3-1.1 openSUSE-SU-2026:10266-1
ReleasePackageFixed inAdvisory
Alpine v3.24 valkey 9.0.3-r0 —
Alpine v3.23 valkey 9.0.3-r0 —

Advisories 1

References