# CVE-2026-9100: mongo-c-driver: The MongoDB C Driver's legacy GridFS API accepts malformed file metadata from the database without adequate validation

CVE-2026-9100 is fixed in mongo-c-driver on 1 platform, first by DEBIAN-CVE-2026-9100, released May 27, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-9100
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0030
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 20, 2026

## 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).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | mongo-c-driver Debian 12.15 (bookworm) | 1.23.1-1+deb12u3 | [DEBIAN-CVE-2026-9100](https://patchblox.com/security/data/fix/linux/debian-cve-2026-9100.md) | May 27, 2026 |
| Linux | mongo-c-driver Debian 13.5 (trixie) | 1.30.4-1+deb13u2 | [DEBIAN-CVE-2026-9100](https://patchblox.com/security/data/fix/linux/debian-cve-2026-9100.md) | May 27, 2026 |
| Linux | mongo-c-driver Debian 14 | 2.2.4-1 | [DEBIAN-CVE-2026-9100](https://patchblox.com/security/data/fix/linux/debian-cve-2026-9100.md) | May 27, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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