# CVE-2026-126823: MongoDB JDBC driver code injection via shared temp location

Source: https://junglewise.ai/threats/cve-2026-126823-a-local-user-with-an-ordinary-account-on-the-same-host-can-place  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-12. Updated: 2026-11-12  
License: CC BY 4.0 with a link back

CVE-2026-126823 · Severity: high · CVSS 7 · Published 2026-11-12

The MongoDB JDBC driver loads native libraries from a shared temporary location without verifying the file's source, allowing a local attacker to place a malicious library that runs arbitrary code. An attacker with a regular user account on the same system can inject code that runs inside database applications using the driver, potentially stealing or modifying data or causing the application to crash.

Vendors: [MongoDB](https://junglewise.ai/threats/vendors/mongodb).

## Quick answers

**Is CVE-2026-126823 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-126823 being exploited in the wild.

**How severe is CVE-2026-126823?** High severity, with a CVSS score of 7, published 12 November 2026.

**Which products and versions are affected?** MongoDB JDBC driver.

**Is there a fix for CVE-2026-126823?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-126823 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-126823?** Check whether you run MongoDB JDBC driver. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a local privilege escalation via unsafe native library loading in the MongoDB JDBC driver. An unprivileged local user can place a malicious file in a shared temp directory that the driver's native library loading routine accepts without origin verification. When a Java application loads the driver class, the malicious library is executed in the application's process context, granting the attacker the privileges of that process.

## Affected products

- MongoDB JDBC driver

## Timeline

- 2026-11-12: disclosed

## References

- [https://jira.mongodb.org/browse/SQL-3540](https://jira.mongodb.org/browse/SQL-3540)