CVE-2025-46819

A vulnerability was found in Redis where an authenticated user to run a crafted Lua script that can read out‑of‑bounds memory or crash the server, leading to information disclosure and denial of service.

This is rated Moderate because exploitation requires an authenticated Redis account with permission to execute Lua (EVAL/FUNCTION), and the impact is limited to out‑of‑bounds reads and process crash (DoS) rather than code execution or privilege escalation. The attack surface is limited to environments where the attacker already possesses valid credentials and can invoke Lua (EVAL/FUNCTION), raising exploitation complexity and narrowing exposure compared to unauthenticated or privilege‑escalating flaws.

This flaw exists only in the Redis server implementation;

Redis client libraries (Python, Node.js, Rust, etc.) are not affected by this vulnerability, and it only exists in the Redis server’s embedded Lua engine where scripts execute. Client libraries merely transmit EVAL/EVALSHA to the server.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.

To reduce the risk, restricting network access to trusted hosts, enforcing strong authentication and protected-mode, disabling or limiting Lua scripting where possible can be be benificial and apply least-privilege ACLs to reduce who can run scripting commands, keep instances non-public with firewalls/VPCs, and follow Redis hardening guidance to minimize exposure.