CVE-2026-27623
Valkey vulnerability analysis and mitigation

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.


SourceNVD

Related Valkey vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2025-49844CRITICAL9.9
  • RedisRedis
  • valkey-devel
NoYesOct 03, 2025
CVE-2026-27623HIGH7.5
  • ValkeyValkey
  • cpe:2.3:a:lfprojects:valkey
NoYesFeb 23, 2026
CVE-2026-21863HIGH7.5
  • RedisRedis
  • cpe:2.3:a:lfprojects:valkey
NoYesFeb 23, 2026
CVE-2025-67733HIGH7.1
  • RedisRedis
  • valkey
NoYesFeb 23, 2026
ELSA-2025-21916HIGHN/A
  • ValkeyValkey
  • valkey
NoYesNov 25, 2025

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