CVE-2026-106435

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.

CVSS 4.0

5.9CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.09% chance of exploitation in the next 30 days; higher than 0% of CVEs (scores of 2026-10-25)

CWE

CWE-125

Published

2026-10-08

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

Affected

• mongodb:python_driver

References

• https://jira.mongodb.org/browse/PYTHON-6110

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