# CVE-2026-81526: Cross-database write redirection via unvalidated dotted database name in bulk write namespaces

> CVE-2026-81526: Cross-database write redirection via unvalidated dotted database name in bulk write namespaces. CVSS 6.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-81526
Last updated: 2026-09-29T19:16:45Z

- Published: 2026-08-27 18:32 UTC · Updated: 2026-09-29 19:16 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:H/A:N
- EPSS: 0.40%, 34th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-74

## Description

The MongoDB Rust Driver does not neutralize special characters in a caller-supplied target identifier before embedding it in the request it sends to the server. An actor able to influence that identifier in an application using the driver may cause write operations to be applied to an unintended target within the same deployment using the application's own credentials. This may result in unauthorized modification of data belonging to another logical boundary enforced by the application.

## Affected vendors and products

- MongoDB: Rust 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-2026-81526)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-81526)
- [https://github.com/mongodb/mongo-rust-driver/releases/tag/v3.8.2](https://github.com/mongodb/mongo-rust-driver/releases/tag/v3.8.2)
- [https://jira.mongodb.org/browse/RUST-2467](https://jira.mongodb.org/browse/RUST-2467)

---

_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/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-81526 · Markdown: https://rewindex.com/cve/CVE-2026-81526.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-81526 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:17:07.359Z