SB2026101535 - Out-of-bounds read in mongo-python-driver

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Main Vulnerability Database SB2026101535

SB2026101535 - Out-of-bounds read in mongo-python-driver

Published: October 15, 2026

Security Bulletin ID SB2026101535
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-106435)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in the C extension's BSON decoder when decoding malformed Regex elements. A remote attacker can supply a BSON document containing a truncated Regex element to cause a denial of service.

Exploitation requires the C extension to be loaded and untrusted BSON to be decoded from buffers without a NUL sentinel, such as mmap or array buffers accepted by bson.decode and bson.decode_all. The driver's own transport and pure-Python installations are not affected.


Remediation

Install update from vendor's website.

References