CVE-2025-46819: 
Redis vulnerability analysis and mitigation

CVE-2025-46819 is a security vulnerability discovered in Redis, an open-source, in-memory database that persists on disk. The vulnerability was disclosed on October 3, 2025, affecting all versions of Redis up to and including version 8.2.1 that have Lua scripting enabled. The issue allows an authenticated user to use specially crafted LUA scripts to read out-of-bound data or crash the server, potentially leading to denial of service (Redis Release, NVD).

The vulnerability is classified as an Integer Overflow or Wraparound (CWE-190) issue in the Lua scripting functionality. It has been assigned a CVSS v3.1 base score of 6.3 (Medium), with the following vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H. This indicates that the vulnerability requires local access, high attack complexity, and low privileges, but can result in high impacts to confidentiality and availability (Security Advisory).

The vulnerability can lead to two primary security impacts: unauthorized access to out-of-bound data and potential denial of service through server crashes. The high confidentiality impact rating suggests that an attacker could potentially access sensitive information, while the high availability impact indicates the possibility of significant service disruption (Security Advisory).

The vulnerability has been patched in Redis version 8.2.2. For systems that cannot immediately update, a workaround is available by preventing users from executing Lua scripts. This can be implemented using Access Control Lists (ACL) to block script execution by restricting both the EVAL and FUNCTION command families (Redis Release, Security Advisory).