Uncontrolled resource consumption in HackerOne just-extend
Priority MEDIUM 46CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- 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-400.
Summary
A prototype pollution vulnerability was found in just-extend <4.0.0 that allows attack to inject properties onto Object.prototype through its functions.
Why it matters now
EPSS 0.01836 79th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed just-extend (HackerOne): 4.0.0just-extend (npm): 4.0.0
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 |
|---|---|---|---|---|---|
| HackerOne | just-extend | before 4.0.0 | 4.0.0 | Patch available | CNA |
| — | just-extend (npm) | before 4.0.0 | 4.0.0 | Patch available | GHSA-675m-85rw-j3w4 |
- just-extend VendorHackerOne Affected before 4.0.0 Fixed in 4.0.0 Patch available CNA
- just-extend (npm) Vendor— Affected before 4.0.0 Fixed in 4.0.0 Patch available GHSA-675m-85rw-j3w4
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:just-extend_project:just-extend:*:*:*:*:*:node.js:*:* | before 4.0.0 | Vulnerable | Just-extend Project |
- cpe:2.3:a:just-extend_project:just-extend:*:*:*:*:*:node.js:*:* Versions before 4.0.0 Vulnerable ·Just-extend Project
Remediation
- Fix · CNA just-extend (HackerOne) Fixed in 4.0.0
- Fix · GHSA-675m-85rw-j3w4 just-extend (npm) Fixed in 4.0.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2018-16489
- 2026-10-03 Alias added: GHSA-675m-85rw-j3w4
References
Sources
- CVE-2018-16489 · CVE Program
- CVE-2018-16489 · NVD
- FIRST EPSS
- GHSA-675m-85rw-j3w4 · GitHub Advisory Database · CC BY 4.0
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