Valkey 8.1.6

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

Security fixes

• (CVE-2026-21863) Remote DoS with malformed Valkey Cluster bus message
• (CVE-2025-67733) RESP Protocol Injection via Lua error_reply

Bug fixes

• Restrict ttl from being negative and avoid crash in import-mode (#2944)
• Fix chained replica crash when doing dual channel replication (#2983)
• Fix used_memory_dataset underflow due to miscalculated used_memory_overhead (#3005)
• Fix crashing while MODULE UNLOAD when ACL rules reference a module command or subcommand (#3160)
• Fix server assert on ACL LOAD and resetchannels (#3182)
• Fix bug causing no response flush sometimes when IO threads are busy (#3205)