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VulnerabilityPublished

CVE-2026-120673: MongoDB Rust Driver · Sensitive Data in Logs

Affects MongoDB Rust DriverSource CVE Database V5

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Not known to be exploited · CVSS 6.8 Medium : upgrade to 3.9.1 when convenient.

Data as of 3 Nov 2026, 18:43 UTC

CVSS 4.0 base score
6.8Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (mongodb)CVSS 4.06.8
CNA (mongodb)CVSS 3.15.5
Patch
Available – fixed in 3.9.1
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.

What to do

Upgrade MongoDB Rust Driver to 3.9.1.

Affected software

ProductAffectedFixed in
MongoDBRust DriverAffected
  • >=3.4.0 <3.9.1
Fixed in
  • 3.9.1

Description

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.

References

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