CVE-2026-27623: high-severity vulnerability in valkey-io valkey
Valkey has Pre-Authentication DOS from malformed RESP request
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.4%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
valkey-io · valkeyRelated CVEs — valkey-io valkey
In the same product, most dangerous first.
CVE-2026-63639HIGHValkey: UAF in stream deserialization may lead to remote code executionEPSS 0.9%CVE-2026-85522MEDIUMvalkey-io valkey Slot Migration cluster_migrateslots.c createSlotImportJob out-of-boundsEPSS 0.9%CVE-2026-21863HIGHMalformed Valkey Cluster bus message can lead to Remote DoSEPSS 0.8%CVE-2025-67733HIGHValkey Affected by RESP Protocol Injection via Lua error_replyEPSS 0.6%CVE-2026-86227LOWvalkey-io valkey kvstore.c kvstoreGetHashtable out-of-boundsEPSS 0.5%CVE-2026-56684HIGHValkey: TLS pending-data processing use-after-free may allow remote code executionEPSS 0.5%