# CVE-2026-8843: Calling createIndex with certain index types can crash mongod

> CVE-2026-8843: Calling createIndex with certain index types can crash mongod. CVSS 6.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-8843
Last updated: 2026-09-24T17:31:28Z

- Published: 2026-05-18 15:40 UTC · Updated: 2026-09-24 17:31 UTC · Assigner: mongodb
- CVSS: 6.5 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.24%, 15th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-617

## Description

Creating a "2dsphere\_bucket" index on a non-timeseries bucket collection will succeed, but any subsequent attempt to insert a document which triggers updating that index will crash the server. A similar issue occurs when creating "queryable\_encrypted\_range" indices. This issue affects MongoDB Server v7.0 versions prior to 7.0.32, v8.0 versions prior to 8.0.21 and v8.2 versions prior to 8.2.6

## Affected vendors and products

- MongoDB, Inc.: MongoDB Server

## Tracked companies

- [MongoDB Atlas](https://rewindex.com/company/mongodb-atlas.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-8843)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-8843)
- [https://jira.mongodb.org/browse/SERVER-116327](https://jira.mongodb.org/browse/SERVER-116327)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-8843 · Markdown: https://rewindex.com/cve/CVE-2026-8843.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-8843 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:11:04.664Z