# CVE-2026-120673: Rust Driver 3.9.1 exports CSFLE plaintext in `db.query.text` before encrypting the command

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

A component of the MongoDB Rust Driver that records diagnostic tracing data can capture command content before automatic client-side field level encryption is applied. In deployments that turn on the optional tracing capability together with automatic in-use encryption, a party with read access to the application's exported trace data may obtain field values that the application designated for encryption, without access to the encryption keys. This may result in unintended disclosure of data.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- MongoDB / Rust Driver: ≥ 3.4.0; < 3.9.1 (affected, semver). Source: CNA: mongodb

## Severity and prioritization

- CVSS 4.0: 6.8 (medium); CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N; source: CNA: mongodb

- CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N; source: CNA: mongodb

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-532

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

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

## Provenance

- CNA: mongodb: https://www.cve.org/CVERecord?id=CVE-2026-120673; retrieved 2026-11-03; source updated 2026-11-03

Revision: 64f013d8a6c50ed11db667953c218ecfb822b3d88ef4b945cc0ba841ecd31975

Canonical: https://y2.dev/cve/CVE-2026-120673

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