PatchSiren cyber security CVE debrief

CVE-2026-9752 MongoDB CVE debrief

CVE-2026-9752 is a HIGH severity vulnerability with a CVSS score of 7.1. An authorized user could trigger a server crash by running a query with a 2dsphere index on a field that stores a GeoJSON GeometryCollection containing a Polygon with a strict-winding CRS. This occurs because the guard that rejects strict-winding polygons does not inspect members of a GeometryCollection, allowing the unsafe path to be reached, which ends with a null-pointer dereference.

Vendor: MongoDB
Product: MongoDB Server
CVSS: HIGH 7.1
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-09
Original CVE updated: 2026-06-10
Advisory published: 2026-06-09
Advisory updated: 2026-06-10

Who should care

Users of MongoDB should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability exists in MongoDB, which allows an authorized user to trigger a server crash. The issue arises from the improper handling of GeoJSON GeometryCollections containing Polygons with strict-winding CRS in 2dsphere indexes.

Defensive priority

HIGH

Recommended defensive actions

Apply the patch or update as recommended by the vendor.
Restrict access to the MongoDB instance to only trusted users.
Monitor MongoDB instance for unusual activity.

Evidence notes

The CVE record and details were obtained from the official CVE website and the NVD database.

Official resources

CVE-2026-9752 was published on 2026-06-09T23:17:04.770Z and modified on 2026-06-10T19:43:28.857Z.