CVE-2026-6231: The bson_validate function may return early on specific inputs and incorrectly report success. This behavior could result in skipping validation for BSON data…

PriorityP345high7.5CVSS 3.1

AVNACLPRNUINSUCNIHAN

EPSS

0.18%

8.2th percentile

The bson_validate function may return early on specific inputs and incorrectly report success. This behavior could result in skipping validation for BSON data, allowing malformed or invalid UTF-8 sequences to bypass validation and be processed incorrectly. The issue may affect applications that rely on these functions to validate untrusted BSON data before further processing. This issue affects MongoDB C Driver versions prior to 1.30.5, MongoDB C Driver version 2.0.0 and MongoDB C Driver version 2.0.1

Affected

4 ranges

Vendor	Product	Version range	Fixed in
mongodb	c_driver	< 1.30.5	1.30.5
mongodb	c_driver	>= 2.0.0 < 2.0.2	2.0.2
mongodb_inc	c_driver	>= 1.0 < 1.30.5	1.30.5
mongodb_inc	c_driver	>= 2.0 < 2.0.2	2.0.2

CVSS provenance

nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

nvdv4.05.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.