# CVE-2026-82055: MongoDB null pointer dereference in 2dsphere index

Source: https://junglewise.ai/threats/cve-2026-82055-mongodb-null-pointer-dereference-in-2dsphere-index  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-82055 · Severity: medium · CVSS 6.5 · Published 2026-09-08

MongoDB is a popular database platform used to store and retrieve application data. When malformed geographic data is inserted into a collection with a 2dsphere index, a software defect causes the database server to crash, resulting in service downtime. An authenticated user with write permissions can exploit this to disrupt operations.

Technologies: [MongoDB](https://junglewise.ai/threats/technologies/mongodb), [MongoDB Server](https://junglewise.ai/threats/technologies/mongodb-server). Vendors: [MongoDB](https://junglewise.ai/threats/vendors/mongodb).

## Quick answers

**Is CVE-2026-82055 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82055 being exploited in the wild.

**How severe is CVE-2026-82055?** Medium severity, with a CVSS score of 6.5, published 8 September 2026.

**Which products and versions are affected?** MongoDB Server 7.0.0–9.1.0 (see notes).

**Is there a fix for CVE-2026-82055?** A patch was published on 2026-09-08: Fix versions released: 8.2.13, 8.3.9, 9.0.0-rc2, 9.1.0-rc0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-82055 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-82055?** Check whether you run MongoDB or MongoDB Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a null pointer dereference in MongoDB's GeoJSON parsing logic for 2dsphere index key generation. When GeoJSON parsing fails, the GeometryContainer object fails to clean up its internal state (specifically the _polygon field), but the code then attempts a fallback to legacy point parsing. If the fallback succeeds, downstream geometry processing functions (projectInto, getS2Region) access the stale, uninitialized object state and dereference a null pointer, crashing the mongod process. The vulnerability requires an authenticated user with write access to insert a specially crafted GeoJSON document. The issue affects MongoDB 8.2 through 9.1 with V1–V4 index versions depending on release; versions 8.0 and 7.0 exit early on GeoJSON parsing failure and are not affected. Patches are available in versions 8.2.13, 8.3.9, 9.0.0-rc2, 9.1.0-rc0 and later.

## Affected products

- MongoDB MongoDB Server 7.0.0–9.1.0 (see notes)

## Timeline

- 2026-09-08: disclosed: Vulnerability published in NVD
- 2026-09-08: patched: Fix versions released: 8.2.13, 8.3.9, 9.0.0-rc2, 9.1.0-rc0

## References

- [https://jira.mongodb.org/browse/SERVER-130202](https://jira.mongodb.org/browse/SERVER-130202)

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