CVE-2026-106435

medium

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.

References

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

https://github.com/mongodb/mongo-python-driver/security/advisories/GHSA-98qm-wvgf-w4cf

https://github.com/mongodb/mongo-python-driver/releases/tag/4.18.3

https://github.com/mongodb/mongo-python-driver/pull/3109

https://github.com/mongodb/mongo-python-driver/commit/bb8d4e195275e75bd94ebeffb53cc747d357fcf4

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95254

Details

Source: Mitre, NVD

Published: 2026-10-08

Updated: 2026-10-15

Named Vulnerability: GHSA-98qm-wvgf-w4cfNamed Vulnerability: GHSA-86gh-39m5-hhg6

Risk Information

CVSS v2

Base Score: 3.8

Vector: CVSS2#AV:L/AC:H/Au:S/C:N/I:N/A:C

Severity: Low

CVSS v3

Base Score: 4.7

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

Severity: Medium

CVSS v4

Base Score: 5.9

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

Severity: Medium

EPSS

EPSS: 0.00094