Redis: Performance Optimizations and Security Improvements
Redis merged four pull requests on April 27th, 2026, focusing on SCAN command performance improvements and security fixes. The updates include replacing linked lists with vectors for better memory efficiency and fixing potential stack overflow issues in radix tree operations.
Duration: PT1M47S
Episode overview
This episode is a short developer briefing from Redis.
It explains recent repository work in plain language.
- Show: Redis
- Published: 2026-04-27T00:00:00Z
- Audio duration: PT1M47S
Transcript excerpt
This excerpt keeps the crawler page concise. Listen to the episode or use the RSS feed for the full update.
Good morning. This is your Redis development update for April 27th, 2026.
Filipe Oliveira merged a performance optimization that replaces linked lists with vectors in the SCAN command's key collection process. The change eliminates roughly 500 memory allocations per SCAN operation with COUNT 500, using a 256-element stack buffer instead. Benchmarks show performance gains ranging from 2%…
Oliveira also merged a security follow-up that removes pre-allocation of vectors based on user-supplied COUNT values. This prevents potential denial-of-service attacks where clients could request massive memory allocations upfront by passing extremely large COUNT parameters.
Stanislav Georgiev merged a critical fix replacing recursive radix tree freeing with iterative traversal. The previous implementation could cause stack overflow crashes on trees with pathologically deep paths. The new approach uses an explicit heap-allocated stack, eliminating the recursion risk while maintaining…
Curtis Means updated the security vulnerability reporting instructions, directing reports to the Redis Vulnerability Disclosure Program instead of direct email to the core team. The change includes a new dedicated…
What's…
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