Vulnerability · Published Sep 10, 2026 · Assigned by mongodb
CVE-2026-88034GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoDB C++ Driver
High 8.3
In plain English
A high-severity security flaw in C++ Driver from MongoDB. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Improper neutralization of special elements in data query logic in the GridFS component of the MongoDB C++ Driver can cause a caller-supplied structured file identifier to be interpreted as a query condition rather than as a literal identifier. An authenticated user who can influence the identifier passed by an affected application may obtain stored file content beyond the intended target or cause all GridFS file chunks in the affected bucket to be removed, rendering stored file content unreadable.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | mongo-cxx-driver | 4.5.3-1 | DEBIAN-CVE-2026-88034 |
| Ubuntu:26.10 | mongo-cxx-driver | no fix listed | UBUNTU-CVE-2026-88034 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| MongoDB | C++ Driver | 3.2.0 – before 4.5.3 |
Weakness: CWE-943 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H