Prototype pollution in express-fileupload
Priority MEDIUM 50CWE-1321Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Tampering
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-915.
Summary
This affects the package express-fileupload before 1.1.8. If the parseNested option is enabled, sending a corrupt HTTP request can lead to denial of service or arbitrary code execution.
Why it matters now
EPSS 0.04762 91st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed express-fileupload: 1.1.8express-fileupload (npm): 1.1.9
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 |
|---|---|---|---|---|---|
| — | express-fileupload | before 1.1.8 | 1.1.8 | Patch available | CNA |
| — | express-fileupload (npm) | before 1.1.9 | 1.1.9 | Patch available | GHSA-9wcg-jrwf-8gg7 |
- express-fileupload Vendor— Affected before 1.1.8 Fixed in 1.1.8 Patch available CNA
- express-fileupload (npm) Vendor— Affected before 1.1.9 Fixed in 1.1.9 Patch available GHSA-9wcg-jrwf-8gg7
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:express-fileupload_project:express-fileupload:*:*:*:*:*:*:*:* | before 1.1.8 | Vulnerable | Express-fileupload Project |
| cpe:2.3:a:netapp:max_data:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
- cpe:2.3:a:express-fileupload_project:express-fileupload:*:*:*:*:*:*:*:* Versions before 1.1.8 Vulnerable ·Express-fileupload Project
- cpe:2.3:a:netapp:max_data:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
Remediation
- Fix · CNA express-fileupload Fixed in 1.1.8
- Fix · GHSA-9wcg-jrwf-8gg7 express-fileupload (npm) Fixed in 1.1.9 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2020-7699
- 2026-10-03 Alias added: GHSA-9wcg-jrwf-8gg7
References
Advisory 2
Sources
- CVE-2020-7699 · CVE Program
- CVE-2020-7699 · NVD
- FIRST EPSS
- GHSA-9wcg-jrwf-8gg7 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences