valkey-io/valkey 9.1.1

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Valkey 9.1.1 - 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

• Omit the implicit alldbs ACL rule from ACL LIST, ACL SAVE and CONFIG REWRITE so older versions can parse the output by @dvkashapov (#3964)
• Improve throughput when IO threads are enabled by offloading object deallocation from the main thread by @roshkhatri (#3938)
• Fix use-after-free crash when ACL LOAD removes a user whose authenticated client has its close deferred by @ranshid (#3800)
• Enforce db= ACL permissions on every DB clause of COPY, closing a bypass with REPLACE or repeated DB tokens by @enjoy-binbin (#3801)
• Enforce database-level ACLs for CLUSTER FLUSHSLOT, which removes keys from all databases by @enjoy-binbin (#3806)
• Fix use-after-free in the module API when unregistering the first registered cluster message receiver by @eifrah-aws (#3846)
• Fix HRANDFIELD with a positive count looping forever when non-expired fields are fewer than the requested count by @cjx-zar (#4047)
• Fix clients left on the wrong database after module keyspace notifications for MOVE and COPY by @enjoy-binbin (#4024)
• Fix Sentinel crash during coordinated failover when the command link to the old primary disconnects by @lukepalmer (#4068)
• Fix crash when active hash field expiration leaves a single-entry expiry bucket whose last field is later removed by @ranshid (#3950)
• Fix assertion in HEXPIRE, HGETDEL and HPERSIST when a module blocks the client in a keyspace notification callback by @enjoy-binbin (#3743)
• Fix undefined behavior in the failover delay calculation when cluster-node-timeout is below 30 milliseconds by @enjoy-binbin (#3941)
• Reject zipmap RESTORE/RDB 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 crash on skiplist conversion by @madolson (#3921)
• Fix corrupted replies (dropped leading bytes) caused by a reply buffer race when IO threads are enabled by @nanyan0312 (#4060)
• Fix startup crash on 32-bit systems where time_t is 64-bit (such as Alpine 3.23) when generating INFO output by @chenshi5012 (#3787)
• HGETDEL now returns a syntax error when the FIELDS keyword is missing or misplaced by @lcxn123 (#4049)
• COMMAND INFO in RESP3 now returns the subcommands field as an array instead of a set for commands without subcommands by @rickrams (#3939)
• Send the replica version on the dual-channel RDB connection so full syncs with newer encodings like hash field TTLs succeed by @hpatro (#4105)
• Fix duplicate failure handling and an invalid reply sequence in cluster slot migration by @chx9 (#3723)
• Reject control characters in SENTINEL SET values to prevent config-file injection via Sentinel config rewrite by @eifrah-aws (#3847)
• Reject control characters and delimiters in cluster AUX fields and validate cluster-announce-ip to prevent nodes.conf injection by @eifrah-aws (#3848)
• Redact key names and user data from more server log messages when hide-user-data-from-log is enabled by @zackcam (#3872)
• ACL LOG now reports the denied database ID for COPY instead of the command name when db= access is denied by @enjoy-binbin (#3888)
• Fix garbled shard IDs in the cluster UPDATE message log line by @enjoy-binbin (#3942)
• Fix negative master_sync_total_bytes in INFO replication during disk-based sync when the RDB exceeds 2GB by @chx9 (#3811)
• Increase the maximum process title length from 255 to 1024 characters to avoid truncation with long paths by @pkhartsk (#3843)

Full Changelog: 9.1.0...9.1.1