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CVE-2026-106435 Details

Description

The MongoDB Python Driver's binary accelerator can read outside a buffer when an application decodes malformed BSON containing a truncated regular-expression element without a trailing NUL byte. An actor who can supply BSON to the documented decode or decode_all API can cause the application process to terminate when the C extension is loaded. The driver's normal database wire-protocol path does not reach this code.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:4.7 MEDIUMVector:CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CNA: [email protected]CVSS-B:5.1 MEDIUMVector:CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://jira.mongodb.org/browse/PYTHON-6110	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-125	Out-of-bounds Read	[email protected]

Affected Products

Product	Versions
mongodb python driver	< 4.18.3
CPE cpe:2.3:a:mongodb:python_driver::::::mongodb::* Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Oct 15, 2026	Initial Analysis	[email protected]
Oct 9, 2026	CVE Modified	CISA-ADP
Oct 8, 2026	New CVE Received	[email protected]