# CVE-2026-9100: Heap memory out of bounds read and crash in C Driver legacy GridFS file reader

> CVE-2026-9100: Heap memory out of bounds read and crash in C Driver legacy GridFS file reader. CVSS 5.9 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-9100
Last updated: 2026-09-24T17:30:59Z

- Published: 2026-05-20 15:55 UTC · Updated: 2026-09-24 17:30 UTC · Assigner: mongodb
- CVSS: 5.9 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H
- EPSS: 0.30%, 23th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-1285

## Description

The MongoDB C Driver's legacy GridFS API accepts malformed file metadata from the database without adequate validation. Crafted documents in a GridFS collection may cause any application that reads those files via the legacy API to either crash (via a division-by-zero) or silently leak process memory contents (via an out-of-bounds read).

## Affected vendors and products

- MongoDB, Inc.: 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-2026-9100)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-9100)
- [https://jira.mongodb.org/browse/CDRIVER-6281](https://jira.mongodb.org/browse/CDRIVER-6281)

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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-2026-9100 · Markdown: https://rewindex.com/cve/CVE-2026-9100.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-9100 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:05:28.303Z