Analyst readout for executives and security teams
Plain-English summary
A low-privileged authorized MongoDB user may be able to crash an affected server using certain GeoJSON data with a 2dsphere index. The business impact is service disruption, not confirmed data theft or tampering. The provided sources do not name a fixed version or workaround.
Executive priority
Treat this as a high-priority availability risk for exposed MongoDB services, especially multi-tenant or customer-facing systems. It warrants rapid inventory, access review, and vendor-patch tracking.
Technical view
MongoDB Server can hit a null-pointer dereference during 2dsphere index key generation for a GeoJSON GeometryCollection containing a Polygon with strict-winding CRS. Strict-winding polygons are unsupported for indexing, but the rejection guard does not inspect GeometryCollection members. CVSS v4.0 is 7.1 with high availability impact.
Likely exposure
Likely exposure is affected MongoDB Server versions 8.3.0, 8.2.0, 8.0.0, and 7.0.0 where authenticated users can query 2dsphere-indexed GeoJSON fields containing GeometryCollection data.
Exploitation context
The CVE is not listed as KEV in the provided bundle, and no cited source confirms active exploitation. Exploitation requires network access and low privileges, with no user interaction, and appears focused on crashing the server.
Researcher notes
The key issue is missed validation inside GeometryCollection members before geospatial index key generation. Evidence supports denial of service via null-pointer dereference, but the bundle does not provide patch details, exploit status, or broader affected configurations.
Mitigation direction
- Check MongoDB guidance for fixed versions or official mitigations.
- Prioritize patching once MongoDB identifies a corrected release.
- Restrict who can write or query indexed GeoJSON fields.
- Review use of 2dsphere indexes on user-controlled GeometryCollection data.
- Increase monitoring for MongoDB crashes and unexpected restarts.
Validation and detection
- Inventory MongoDB Server versions against the affected list.
- Find collections with 2dsphere indexes on GeoJSON fields.
- Identify application paths accepting user-supplied GeometryCollection data.
- Review crash logs for null-pointer or geospatial indexing failures.
- Confirm vendor advisories before declaring remediation complete.
Public sources used
Based on public source material and reviewed before publication.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2026-9752 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N — — mongodb CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H 2.8 3.6 mongodb Vulnerability scoring details
Base CVSS 4.0 score
7.1 HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
6.5 MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reserved CVE Program
The CVE ID was reserved by the assigning CNA.
- CVE published CVE Program
The CVE record was published.
- CVE updated CVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 source CVE List V5
- https://jira.mongodb.org/browse/SERVER-123440 CVE reference, mongodb
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.