# CVE-2026-18711: Use-After-Free in MongoDB Query Execution Engine Leads to Denial of Service and Potential Memory Disclosure

> CVE-2026-18711: Use-After-Free in MongoDB Query Execution Engine Leads to Denial of Service and Potential Memory Disclosure. CVSS 7.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-18711
Last updated: 2026-09-25T15:35:43Z

- Published: 2026-08-11 18:48 UTC · Updated: 2026-09-25 15:35 UTC · Assigner: mongodb
- CVSS: 7.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
- EPSS: 0.49%, 42th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-416

## Description

An issue in MongoDB Server's query execution engine could allow an authenticated user with read and write privileges to cause an internal reference to be used after the underlying memory has been freed, when running certain queries against time-series collections. This could result in a server crash or disclosure of freed memory contents within query results.

## Affected vendors and products

- MongoDB: 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-2026-18711)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-18711)
- [https://jira.mongodb.org/browse/SERVER-130247](https://jira.mongodb.org/browse/SERVER-130247)

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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-2026-18711 · Markdown: https://rewindex.com/cve/CVE-2026-18711.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-18711 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:07.420Z