valkey

Valkey 9.0.5 - Released Tue 21 July 2026

Upgrade urgency SECURITY: This release includes security fixes we recommend you apply as soon as possible.

Security Fixes

• CVE-2026-56684: Fix a use-after-free in TLS connection handling that could allow an authenticated client to achieve remote code execution using CLIENT KILL (#4234)
• CVE-2026-63639: Reject corrupt stream RDB files containing a shared NACK across consumers, which could allow remote code execution. Reported by @z0v3r1n and @lifip. (#4073)

Bug Fixes

• Strictly validate CRLF terminators when parsing the RESP protocol; malformed requests now get a protocol error instead of being misparsed by @enjoy-binbin (#2872)
• Fix a use-after-free crash when creating slot import jobs during manual slot migrations by @twooster (#3283)
• Fix a memory leak in ZDIFF and ZDIFFSTORE when the result set becomes empty before all inputs are processed by @sarthakaggarwal97 (#3342)
• Fix HPERSIST sending a malformed reply that desynchronized the connection when used on a key of the wrong type by @madolson (#3516)
• Fix a crash from a race between IO threads and asynchronous client freeing by @deepakrn (#3458)
• Fix a double free when loading a stream with corrupt consumer PEL data from RDB or RESTORE by @enjoy-binbin (#3498)
• Fix listpack corruption and a subsequent crash when XTRIM marks the last entry of a stream listpack node as deleted by @smkher (#3591)
• Fix malformed replies when module callbacks build deferred-length arrays while a client's deferred reply buffer is active by @eifrah-aws (#3578)
• Fix a NULL pointer crash in TLS pending-data handling by @zuiderkwast (#3641)
• Fix a server crash when multiple RDMA clients disconnect at the same time by @quanyeyang (#3448)
• Fix a use-after-free when ACL LOAD deletes a user whose clients cannot be freed immediately by @ranshid (#3800)
• Fix a use-after-free when a module unregisters the first registered cluster message receiver for a message type by @eifrah-aws (#3846)
• Fix HRANDFIELD looping forever when a hash has fewer non-expired fields than the requested count by @cjx-zar (#4047)
• Fix clients being left on the wrong database after module keyspace notifications for commands like MOVE and COPY by @enjoy-binbin (#4024)
• Fix a Sentinel crash during coordinated failover when the connection to the old primary is disconnected by @lukepalmer (#4068)
• Fix underestimation of client output buffer memory when replies reference shared objects, so buffer limits are enforced correctly by @dvkashapov (#3306)
• Fix a crash on ARM/aarch64 caused by memory-ordering races in the IO thread job queue by @jjuleslasarte (#3878)
• Fix a crash when active hash field expiration leaves a single entry in a large expiration time-bucket by @ranshid (#3950)
• Fix a file descriptor leak when a blocking connection attempt, such as MIGRATE to an unreachable host, times out by @madolson (#3541)
• Fix a potential crash from a dangling slot migration job reference when the migration client is reset by @murphyjacob4 (#3554)
• Remove cached EVAL scripts when their scripting engine is unregistered, preventing dangling engine references by @eifrah-aws (#3503)
• Fix a memory leak in GEOSEARCH BYPOLYGON when argument parsing fails, such as on an invalid COUNT by @bandalgomsu (#3568)
• Fix a crash when a slot migration target node is removed from the cluster before the migration connects by @chenshi5012 (#3596)
• Fix a crash when the module GetLRU/SetLRU/GetLFU/SetLFU APIs are called with a NULL key by @yaronsananes (#3610)
• Fix an assertion failure in hash field expiration commands when a module blocks the client in a keyspace notification by @enjoy-binbin (#3743)
• Fix a cluster UPDATE log message reading shard IDs past their fixed-length buffer by @enjoy-binbin (#3942)
• Fix undefined behavior in the failover delay calculation when cluster-node-timeout is set below 30 milliseconds by @enjoy-binbin (#3941)
• Reject zipmap RESTORE payloads with overflowing length fields that could cause out-of-bounds access on 32-bit builds by @madolson (#3920)
• Reject NAN scores in listpack- and ziplist-encoded sorted sets on RDB/RESTORE load, preventing a later crash on skiplist conversion by @madolson (#3921)
• Fix a startup crash on 32-bit systems with 64-bit time_t, such as Alpine 3.23, caused by time value formatting mismatches by @chenshi5012 (#3787)
• Fix corrupted client replies when IO threads are enabled, caused by a race between in-flight writes and reply buffer reuse by @nanyan0312 (#4060)
• COMMAND INFO in RESP3 now returns the subcommands field as an Array instead of a Set for commands without subcommands by @rickrams (#3939)
• The dual-channel replication RDB connection now announces the configured replica-announce-ip, avoiding stale replica entries behind NAT by @jdheyburn (#2846)
• Prevent replicas from processing stale cluster packets and incorrectly promoting themselves to an empty primary within a shard by @zhijun42 (#2811)
• Send the replica version on the dual-channel RDB connection so full syncs of data like hash field TTLs no longer fail by @hpatro (#4105)
• Fix slot migration failure handling running twice on ownership changes and an out-of-order error reply in the internal SYNCSLOTS FINISH command by @chx9 (#3723)
• Allow slot-migration-max-failover-repl-bytes to be set to -1 to disable the limit, as documented by @enjoy-binbin (#3443)
• Fix CONFIG REWRITE producing negative values for memory configs such as maxmemory when set to very large values by @enjoy-binbin (#3440)
• Reject SENTINEL SET values containing control characters and safely quote Sentinel config values to prevent config file injection by @eifrah-aws (#3847)
• Reject control characters and delimiters in cluster AUX fields and validate cluster-announce-ip to prevent nodes.conf corruption or injection by @eifrah-aws (#3848)
• Fix changes to lua-enable-insecure-api via CONFIG SET not taking effect when the option was set at startup by @enjoy-binbin (#4182)
• Fix incorrect memory overhead reported for watched keys in client memory usage tracking by @enjoy-binbin (#3359)
• Replica logs now report 'Connection reset by peer' instead of the misleading 'Success' when the primary closes the connection by @abmathur-ie (#3580)
• Redact key names and user data from more log messages when hide-user-data-from-log is enabled by @zackcam (#3872)
• Fix INFO replication reporting negative sync transfer sizes when the RDB exceeds 2GB during disk-based sync by @chx9 (#3811)
• Increase the maximum process title length from 255 to 1024 characters to avoid truncation with long installation paths by @pkhartsk (#3843)
• valkey-cli --cluster del-node can now remove unreachable or failed nodes instead of failing with 'No such node ID' by @yang-z-o (#3209)
• Fix valkey-cli crashing after --eval script execution on jemalloc/tcmalloc builds by @bandalgomsu (#3281)
• valkey-cli --cluster fix now spreads uncovered slots randomly across primaries instead of assigning them all to one node by @abmathur-ie (#3586)

Full Changelog: https://github.com/valkey-io/valkey/compare/9.0.4...9.0.5