# CVE-2026-81524: Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C Driver

> CVE-2026-81524: Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C Driver. CVSS 5.4 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-81524
Last updated: 2026-09-29T19:17:16Z

- Published: 2026-08-27 18:32 UTC · Updated: 2026-09-29 19:17 UTC · Assigner: mongodb
- CVSS: 5.4 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- EPSS: 0.27%, 19th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-99

## Description

A weakness in the MongoDB C Driver allows special elements in caller-supplied database and collection name components to pass without sanitization when the driver composes the target namespace for an operation. An application that incorporates untrusted input into these name components can have operations directed at a resource other than the one intended.

## 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-2026-81524)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-81524)
- [https://github.com/mongodb/mongo-c-driver/releases/tag/2.5.1](https://github.com/mongodb/mongo-c-driver/releases/tag/2.5.1)
- [https://jira.mongodb.org/browse/CDRIVER-6424](https://jira.mongodb.org/browse/CDRIVER-6424)

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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-2026-81524 · Markdown: https://rewindex.com/cve/CVE-2026-81524.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-81524 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:17:06.823Z