SB2026102508 - Heap-based buffer overflow in MongoDB driver for C

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026102508

SB2026102508 - Heap-based buffer overflow in MongoDB driver for C

Published: October 25, 2026

Security Bulletin ID SB2026102508
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Heap-based buffer overflow (CVE-ID: CVE-2026-114645)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to corrupt client process memory and cause a denial of service in the client application.

The vulnerability exists due to a heap-based buffer overflow caused by 32-bit integer wraparound in the MongoDB C Driver's Windows Kerberos/SSPI authentication code when wrapping authentication messages using an excessively long URI username. A local privileged user can supply an excessively long username through client-side connection configuration to cause an undersized heap allocation and subsequent out-of-bounds writes, corrupting client process memory and causing a denial of service.

Only client builds compiled with the Windows-native authentication backend are affected.


Remediation

Install update from vendor's website.

References