# CVE-2026-120673: MongoDB Rust Driver information disclosure in diagnostic tracing

Source: https://junglewise.ai/threats/cve-2026-120673-a-component-of-the-mongodb-rust-driver-that-records-diagnostic  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-03. Updated: 2026-11-03  
License: CC BY 4.0 with a link back

CVE-2026-120673 · Severity: medium · CVSS 5.5 · Published 2026-11-03

The MongoDB Rust Driver's diagnostic tracing feature can capture unencrypted database command data before client-side field encryption is applied. If tracing is enabled alongside automatic encryption, an attacker with access to trace logs could read sensitive data fields that should have been encrypted, bypassing encryption protections without needing the encryption keys.

Technologies: [MongoDB Rust Driver](https://junglewise.ai/threats/technologies/rust-driver). Vendors: [MongoDB](https://junglewise.ai/threats/vendors/mongodb).

## Quick answers

**Is CVE-2026-120673 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-120673 being exploited in the wild.

**How severe is CVE-2026-120673?** Medium severity, with a CVSS score of 5.5, published 3 November 2026.

**Which products and versions are affected?** MongoDB Rust Driver prior to 3.10.0.

**Is there a fix for CVE-2026-120673?** Yes: fixed in 3.10.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-120673 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-120673?** Check whether you run MongoDB Rust Driver at an affected version. 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.

## How to fix

- Fixed in 3.10.0

## Technical details

The diagnostic tracing component in the MongoDB Rust Driver records command content at a point in the execution pipeline before automatic client-side encryption (CSFLE) is applied to sensitive fields. An attacker with read access to exported trace data can observe plaintext values of fields designated for encryption. The vulnerability requires both tracing capability and automatic in-use encryption to be enabled, and requires local or logged access to trace output.

## Affected products

- MongoDB Rust Driver prior to 3.10.0

## Timeline

- 2026-11-03: disclosed

## References

- [https://jira.mongodb.org/browse/RUST-2525](https://jira.mongodb.org/browse/RUST-2525)

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- [MongoDB Rust Driver injection in database/collection name](https://junglewise.ai/threats/cve-2026-81526-mongodb-rust-driver-injection-in-database-collection-name)
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