# CVE-2026-11933: Post-authentication use-after-free in server-side JavaScript BSON-to-array conversion

> CVE-2026-11933: Post-authentication use-after-free in server-side JavaScript BSON-to-array conversion. CVSS 8.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-11933
Last updated: 2026-06-22T14:38:54Z

- Published: 2026-06-12 01:57 UTC · Updated: 2026-06-22 14:38 UTC · Assigner: mongodb
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS: 0.38%, 32th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-787

## Description

A use-after-free vulnerability exists in MongoDB Server's server-side JavaScript engine when converting BSON documents to JavaScript arrays. An authenticated user with read privileges who is able to run server-side JavaScript (for example, via $where or $function) can cause the server to access memory that has already been freed. This may result in disclosure of information from the mongod process memory or a denial of service through a server crash.

## Affected vendors and products

- MongoDB: MongoDB

## Tracked companies

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

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-11933)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-11933)
- [https://jira.mongodb.org/browse/SERVER-128125](https://jira.mongodb.org/browse/SERVER-128125)

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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-2026-11933 · Markdown: https://rewindex.com/cve/CVE-2026-11933.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-11933 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:17.976Z