# CVE-2026-114651: Cross-document data leak via malformed BSON array parsing in reused thread buffer

> CVE-2026-114651: Cross-document data leak via malformed BSON array parsing in reused thread buffer. CVSS 4.0 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-114651
Last updated: 2026-10-23T19:45:03Z

- Published: 2026-10-22 19:13 UTC · Updated: 2026-10-23 19:45 UTC · Assigner: mongodb
- CVSS: 4.0 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
- EPSS: 0.39%, 33th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-908

## Description

A memory-handling weakness in the BSON deserialization component of the MongoDB C\# Driver may cause data left over from previously processed content to be returned when specially crafted serialized input is parsed. An unauthenticated party able to supply serialized data to an application that maps certain primitive collection types can cause residual bytes from unrelated data processed earlier on the same execution thread to be surfaced as legitimate values. This can result in disclosure of a limited amount of information belonging to other requests or principals of the consuming application. No authentication or special privileges within the application are required.

## 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-2026-114651)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-114651)
- [https://github.com/mongodb/mongo-csharp-driver/releases/tag/v3.13.0](https://github.com/mongodb/mongo-csharp-driver/releases/tag/v3.13.0)
- [https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-f8xm-c88f-wq46](https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-f8xm-c88f-wq46)
- [https://jira.mongodb.org/browse/CSHARP-6170](https://jira.mongodb.org/browse/CSHARP-6170)

---

_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-2026-114651 · Markdown: https://rewindex.com/cve/CVE-2026-114651.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-114651 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:06:10.593Z