Bug 2442021 (CVE-2026-27623)

Summary: CVE-2026-27623 Valkey: Valkey: Denial of Service via specially crafted network requests
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Valkey. A malicious actor with network access to Valkey can cause the system to shut down by sending a specially crafted request. This occurs because the system does not properly reset its networking state after processing an empty request, leading to an assertion failure. This vulnerability results in a Denial of Service (DoS), making the Valkey database unavailable.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2442222, 2442221    
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Description OSIDB Bzimport 2026-02-23 21:02:41 UTC
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.