A prototype pollution vulnerability was found in just-extend <4.0.0 that allows attack to inject properties onto Object.prototype through its functions
Published Feb 1, 2019
9.8
CRITICALCVSS 3.1
EPSS 1.84%
Description
A prototype pollution vulnerability was found in just-extend <4.0.0 that allows attack to inject properties onto Object.prototype through its functions.
Affected products
-
- Version <4.0.0StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| HackerOne | Just-Extend | n/a |
|
- < 4.0.0
No data.
No Red Hat product state for this CVE.
just-extend
npm
Introduced 0 Fixed 4.0.0
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | just-extend | 0 | 4.0.0 |
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.84% (0.01836) | 78.15th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.84% (0.01836) | 76.08th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.39% (0.00389) | 57.95th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.39% (0.00390) | 74.14th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.39% (0.00390) | 72.59th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.39% (0.00390) | 69.10th | v3 (v2023.03.01) |
| Mar 6, 2023 | 9.03% (0.09029) | 94.14th | v2 (v2022.01.01) |
| Feb 4, 2022 | 9.03% (0.09029) | 86.86th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.84% (0.01840) | 47.83th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.84% (0.01840) | 0.00th | v1 |
References (4)
- https://github.com/advisories/GHSA-675m-85rw-j3w4 Advisory
- https://hackerone.com/reports/430291 x_refsource_MISCExploitIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-16489
- https://www.npmjs.com/advisories/780
| Link | Providers | Tags |
|---|---|---|
| https://github.com/advisories/GHSA-675m-85rw-j3w4 | Advisory | |
| https://hackerone.com/reports/430291 | x_refsource_MISCExploitIssue TrackingThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-16489 | ||
| https://www.npmjs.com/advisories/780 |
Change history (0)
No recorded changes yet.