Read the docs
TI-2020-06137 Aliases CVE-2020-7616GHSA-v39h-qm32-8gwq

Prototype pollution in express-mock-middleware

Priority LOW 27CWE-1321Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Tampering
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-915.

Summary

express-mock-middleware through 0.0.6 is vulnerable to Prototype Pollution. Exported functions by the package can be tricked into adding or modifying properties of the `Object.prototype`. Exploitation of this vulnerability requires creation of a new directory where an attack code can be placed which will then be exported by `express-mock-middleware`. As such, this is considered to be a low risk.

Why it matters now

EPSS 0.01274 70th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—express-mock-middlewareAll versions including 0.0.6—No fix listedCNA
—express-mock-middleware (npm)up to 0.0.6—No fix listedGHSA-v39h-qm32-8gwq
  • express-mock-middleware Vendor— Affected All versions including 0.0.6 Fixed in — No fix listed CNA
  • express-mock-middleware (npm) Vendor— Affected up to 0.0.6 Fixed in — No fix listed GHSA-v39h-qm32-8gwq

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:express-mock-middleware_project:express-mock-middleware:*:*:*:*:*:*:*:*up to 0.0.6VulnerableExpress-mock-middleware Project

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-7616
  2. 2026-10-03 Alias added: GHSA-v39h-qm32-8gwq

References

Advisory 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences