Rust Driver public Client Debug output exposes CSFLE KMS master-key material
Summary
| CVE | CVE-2026-126838 |
|---|---|
| State | PUBLISHED |
| Assigner | mongodb |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-12 19:17:01 UTC |
| Updated | 2026-11-12 19:17:01 UTC |
| Description | A MongoDB Rust Driver component that holds client-side field level encryption settings includes key management service credential material in its diagnostic formatting output without redaction. An application that records or displays this formatted output may place that material where a party with read access to the application's diagnostic output can see it, which may result in unintended disclosure of key material. |
Risk And Classification
Primary CVSS: v4.0 5.7 MEDIUM from [email protected]
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Problem Types: CWE-532 | CWE-532 CWE-532: Insertion of Sensitive Information into Log File
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 5.7 | MEDIUM | CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 5.7 | MEDIUM | CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N |
| 3.1 | [email protected] | Secondary | 5.5 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| 3.1 | CNA | CVSS | 5.5 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
CVSS v4.0 Breakdown
Attack Vector
LocalAttack Complexity
LowAttack Requirements
PresentPrivileges Required
LowUser Interaction
NoneConfidentiality
HighIntegrity
NoneAvailability
NoneSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
NoneAvailability
NoneCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | MongoDB | Rust Driver | affected 3.9.0 3.9.1 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 3.8.0 3.8.2 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 3.7.0 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 3.6.0 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 3.5.0 3.5.2 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 3.4.0 3.4.1 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 3.3.0 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 3.2.0 3.2.5 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 3.1.0 3.1.1 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 3.0.0 3.0.1 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 2.8.0 2.8.2 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 2.7.0 2.7.1 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 2.6.0 2.6.1 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 2.5.0 semver | Not specified |
| CNA | MongoDB | Rust Driver | affected 2.4.0 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| jira.mongodb.org/browse/RUST-2531 | [email protected] | jira.mongodb.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.