redis 8.12-rc3

This is the third Release Candidate of Redis 8.12 in Redis Open Source.

Release Candidates are feature-complete pre-releases. Pre-releases are not suitable for production use.

Security fixes

#16127 A TLS session could be resumed on another listener (client port vs. cluster bus), or after tls-auth-clients or tls-expected-peer-name changed, without the checks of the new settings

New Features

#16135 New commands: ZMOVE, BZMOVE, ZMOVEMEMBER to atomically move members between sorted sets - from either end, by score range, or by name - with COUNT batching and NX/XX destination conditions
#15907 SLOWLOG GET now reports the CPU time of each slow command (a new 8th field), to tell commands that ran slowly apart from commands that were starved of CPU; New configuration parameter: off-cpu-tracking

Modules API

#16105 RedisModule_GetUsedMemoryRatioEstimate - like RedisModule_GetUsedMemoryRatio, but can be called from module threads without holding the GIL

Bug fixes

#16098 A replica that fell behind by more than its output buffer soft limit was disconnected even when repl-backlog-size was larger
#16176 Keys could be lost during atomic slot migration when the destination rejected a command (e.g. -NOREPLICAS due to min-replicas-to-write)
#16210 Set members could be expired incorrectly on the destination during atomic slot migration
#16096 MSETEX with repeated EX or PX options was propagated to replicas and the AOF as an invalid command, losing the keys
#16175 Commands could be replayed twice on AOF load when an AOF rewrite started after an AOF write error (e.g. disk full)
#15955 XADD entries with IDMP could be lost on AOF replay or on a lagging replica, and XIDMPRECORD could crash a lagging replica
#15930 Consumers created by XCLAIM or XAUTOCLAIM that claimed no entries were not propagated to replicas or the AOF
#16121 Some key updates could apply the value or TTL to a different key while the keyspace was being resized
#16042 Redis could crash with io-threads > 1 when running module commands that use getkeys-api or getchannels-api
#16165 Redis could crash when a module read a sorted set emptied by ZPOPMIN/ZPOPMAX from its keyspace notification
#16125 ZRANGESTORE with the same source and destination key could cause a use-after-free when key-memory-histograms or cluster-slot-stats-enabled is enabled
#16167 ZRANGESTORE could create a sorted set with a broken score order when the source was a listpack loaded from an unordered payload
#16164 A sorted set restored without sanitize-dump-payload could store a duplicate member twice after its conversion to the B+tree encoding
#16146 A malformed RESTORE payload or RDB file could corrupt memory (only with modules that register key metadata classes)
#16142 CONFIG GET and CONFIG REWRITE dropped the n, o and c flags of notify-keyspace-events when A was set, so these events stopped after a restart
#16120 DELEX honored lazyfree-lazy-server-del instead of lazyfree-lazy-user-del
#16203 Lua scripts with very deep string patterns could exhaust the stack; such patterns now fail with pattern too complex
#16233 Redis could crash when using preload-file with AOF and a working directory of 1024 bytes or longer
#16062 On FreeBSD, the bundled jemalloc took over libc’s malloc hooks, which could crash multi-threaded tools (e.g. redis-benchmark --threads) and deadlock after fork()
#16117 redis-cli could generate excessive help entries from a COMMAND reply with extreme arity values
#15823 redis-cli --keystats printed empty statistics when no keys were found

Performance and resource utilization improvements

#15622 SORT and SORT_RO no longer convert listpack-encoded sorted sets to B+tree, which increased their memory usage (also on read-only replicas)
#16163 ZADD that converts a sorted set to B+tree no longer leaves an oversized member index, which wasted memory and slowed ZSCAN
#16069 Client memory (tot-mem, mem_clients_normal, maxmemory-clients) now includes the names of watched keys and of Pub/Sub channels and patterns
#16126 Faster ZRANGESTORE for large REV rank ranges
#16156 Faster ZRANDMEMBER with a large positive count on B+tree sorted sets
#15420 Faster SRANDMEMBER with a positive count on hashtable-encoded sets
#15901 Faster HEXPIRE and HSETEX updates of field expiration on listpack-encoded hashes

Source redis/redis · 8.12-rc3 · 2026-11-12 · upstream release

Mirrored verbatim for indexing. All rights belong to the upstream project.

Release notes are published by the upstream project and mirrored here for indexing. All rights belong to their authors.