CVE-2025-32023: redis Integer Overflow to Buffer Overflow

Vulnerability summary

CVE-2025-32023 is a high (CVSS 7.8) Integer Overflow to Buffer Overflow vulnerability in redis. EPSS estimates a 6.47% chance of exploitation in the next 30 days, higher than 93.6% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 07-07-2025
   PublishedVulnerability first disclosed.
2. 04-02-2026
   Last modifiedVulnerability information updated.

Description

Redis is an open source, in-memory database that persists on disk. From 2.8 to before 8.0.3, 7.4.5, 7.2.10, and 6.2.19, an authenticated user may use a specially crafted string to trigger a stack/heap out of bounds write on hyperloglog operations, potentially leading to remote code execution. The bug likely affects all Redis versions with hyperloglog operations implemented. This vulnerability is fixed in 8.0.3, 7.4.5, 7.2.10, and 6.2.19. An additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from executing hyperloglog operations. This can be done using ACL to restrict HLL commands.

• CWE-680Integer Overflow to Buffer OverflowThe product performs a calculation to determine how much memory to allocate, but an integer overflow can occur that causes less memory to be allocated than expected, leading to a buffer overflow.