CVE-2026-83945: microsoft microsoft sql server 2022 for x64-based systems (cu27) Heap-based Buffer Overflow

Vulnerability summary

CVE-2026-83945 is a medium (CVSS 6.6) Heap-based Buffer Overflow vulnerability in microsoft microsoft sql server 2022 for x64-based systems (cu27). EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 35.2% of scored vulnerabilities.

Timeline

1. 13-10-2026
   PublishedVulnerability first disclosed.
2. 20-10-2026
   Last modifiedVulnerability information updated.

Description

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

• 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().