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CVE-2026-106435

5.1 · MEDIUM

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.

Published Oct 8, 2026mongodbCWE-125EPSS 0.09%

Overview

CVE-2026-106435 is a medium-severity vulnerability affecting mongodb python_driver. It was published on October 8, 2026 and has a CVSS 3.1 base score of 5.1 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.1, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from mongodb. Update python_driver to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
mongodbpython_driver>= 0, < 4.18.3Affected

References

Refjira.mongodb.org/browse/PYTHON-6110

How CyberStrike helps

Frequently asked questions

What is CVE-2026-106435?

CVE-2026-106435 is a medium-severity vulnerability affecting mongodb python_driver. It was published on October 8, 2026 and has a CVSS 3.1 base score of 5.1 (MEDIUM).

How severe is CVE-2026-106435?

This vulnerability has a CVSS 3.1 base score of 5.1, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-106435?

Check the references section for vendor advisories and patches from mongodb. Update python_driver to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-106435?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-106435 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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