Infinite loop in aggregation expression
Priority LOW 32CWE-835Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-835.
Summary
A user authorized to perform database queries may trigger denial of service by issuing specially crafted queries, which loop indefinitely in mathematics processing while retaining locks. This issue affects MongoDB Server v4.0 versions prior to 4.0.5; MongoDB Server v3.6 versions prior to 3.6.10 and MongoDB Server v3.4 versions prior to 3.4.19.
Why it matters now
EPSS 0.0144 73rd percentileScored 2026-11-07
Fix Partial MongoDB Server (MongoDB Inc.): 4.0.5, 3.6.10, 3.4.19Red Hat: 2 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MongoDB | MongoDB Server | 4.0 to before 4.0.5; 3.6 to before 3.6.10; 3.4 to before 3.4.19 | 4.0.5, 3.6.10, 3.4.19 | Patch available | CNA |
- MongoDB Server VendorMongoDB Affected 4.0 to before 4.0.5; 3.6 to before 3.6.10; 3.4 to before 3.4.19 Fixed in 4.0.5, 3.6.10, 3.4.19 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:* | 3.4.0 to before 3.4.19; 3.6.0 to before 3.6.10; 4.0.0 to before 4.0.5 | Vulnerable | MongoDB |
- cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:* Versions 3.4.0 to before 3.4.19; 3.6.0 to before 3.6.10; 4.0.0 to before 4.0.5 Vulnerable ·MongoDB
Remediation
- Fix · CNA MongoDB Server (MongoDB Inc.) Fixed in 4.0.5, 3.6.10, 3.4.19
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenStack Platform 10 (Newton) | Affected | No fix planned: Out of support scope |
| Red Hat Software Collections | Affected | No fix planned: Will not fix |
Not affected: 2 products
- Red Hat Advanced Cluster Management for Kubernetes 2
- Red Hat Update Infrastructure 3 for Cloud Providers
Timeline
- 2026-10-02 Threatist record created from CVE-2018-20803
- 2026-10-03 Alias added: GHSA-w7g3-8fq6-h7f2
References
More Mongodb vulnerabilities
- TI-2025-13542 Zlib compressed protocol header length confusion may allow memory read KEVCVSS 4.0HIGH 8.7
- TI-2013-01669 MongoDB before 2.0.9 and 2.2.x before 2.2.4 does not properly validate requests to the… CVSS 2.0MEDIUM 6.0
- TI-2026-56639 Uncontrolled Resource Consumption in MongoDB Sharded Cluster Router Allows Unauthenticated Denial of Service CVSS 4.0HIGH 8.7
- TI-2026-56628 Reachable assertion in MongoDB Server CVSS 4.0HIGH 8.7
- TI-2026-15322 Improper Input Validation in MongoDB Aggregation Framework Allows Unauthenticated Denial of Service on mongos CVSS 4.0HIGH 8.7
- TI-2026-08537 Unbounded recursion in BSONColumn interleaved-reference causes pre-auth stack overflow CVSS 4.0HIGH 8.7
Sources
- CVE-2018-20803 · CVE Program
- CVE-2018-20803 · NVD
- FIRST EPSS
- GHSA-w7g3-8fq6-h7f2 · GitHub Advisory Database · CC BY 4.0
- CVE-2018-20803 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences