# CVE-2026-120956: remote abort and memory disclosure from a malformed cursor.ns

> CVE-2026-120956: remote abort and memory disclosure from a malformed cursor.ns. CVSS 7.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-120956
Last updated: 2026-11-03T20:18:12Z

- Published: 2026-11-03 18:41 UTC · Updated: 2026-11-03 20:18 UTC · Assigner: mongodb
- CVSS: 7.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
- EPSS: 0.25%, 17th percentile (scored 2026-11-04)
- CISA KEV: no
- CWE: CWE-617

## Description

The MongoDB C Driver does not validate the type or format of a namespace field returned by the server in a query response. A MongoDB endpoint that a client application connects to, without needing any credentials, can return a malformed value in that field. This causes the client application process to terminate, and can also cause the driver to read memory outside an allocated buffer and to send a small amount of the application's own uninitialized heap memory back to the endpoint in a follow-up command. The impact is limited to the process that embeds the driver.

## Affected vendors and products

- MongoDB: C Driver

## Tracked companies

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

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-120956)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-120956)
- [https://jira.mongodb.org/browse/CDRIVER-6501](https://jira.mongodb.org/browse/CDRIVER-6501)

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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-2026-120956 · Markdown: https://rewindex.com/cve/CVE-2026-120956.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-120956 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-05T15:28:16.593Z