CVE-2026-70189: microsoft microsoft sql server 2017 for x64-based systems (cu31) Heap-based Buffer Overflow

Vulnerability summary

CVE-2026-70189 is a medium (CVSS 6.7) Heap-based Buffer Overflow vulnerability in microsoft microsoft sql server 2017 for x64-based systems (cu31). EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.1% of scored vulnerabilities.

Timeline

1. 13-10-2026
   PublishedVulnerability first disclosed.
2. 19-10-2026
   Last modifiedVulnerability information updated.

Description

Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code locally.

• CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().