CVE-2018-16469 — The merge.recursive function in the merge package <1.2.1 can be tricked into adding or modifying properties of the Object prototype

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HIGH

The merge.recursive function in the merge package <1.2.1 can be tricked into adding or modifying properties of the Object prototype

Published Oct 30, 2018

7.5

HIGH

CVSS 3.1

EPSS 1.68%

Description

The merge.recursive function in the merge package <1.2.1 can be tricked into adding or modifying properties of the Object prototype. These properties will be present on all objects allowing for a denial of service attack.

Affected products

Vendor HackerOne Product Merge Default
n/a
- Version
  <1.2.1
  Status
  affected
  Constraints
  -

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

Merge

n/a

Version	Status	Constraints
<1.2.1	affected	-

Ecosystem	Package	Introduced	Fixed
npm	merge	0	1.2.1

Remediation

No remediation recorded yet.

Metrics

1.68% 0.01678

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.01678

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v5

Table of values (13 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	1.68% (0.01678)	76.05th	v5 (v2026.06.15)
Jun 15, 2026	1.68% (0.01678)	73.82th	v5 (v2026.06.15)
Jul 20, 2024	0.11% (0.00114)	45.41th	v3 (v2023.03.01)
Jul 10, 2024	0.11% (0.00114)	45.37th	v3 (v2023.03.01)
Mar 7, 2023	0.11% (0.00114)	43.31th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Sep 10, 2022	0.89% (0.00885)	26.24th	v2 (v2022.01.01)
Apr 1, 2022	0.89% (0.00885)	24.24th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)
Feb 3, 2022	0.52% (0.00518)	11.68th	v1
Jan 6, 2022	0.52% (0.00518)	11.22th	v1
Sep 1, 2021	0.52% (0.00518)	29.97th	v1
Apr 14, 2021	0.52% (0.00518)	0.00th	v1

Weaknesses (3)

CWE-1321

CWE-20

Improper Input Validation

CWE-400

Uncontrolled Resource Consumption

References (4)

https://github.com/advisories/GHSA-f9cm-qmx5-m98h
Advisory
https://hackerone.com/reports/381194
x_refsource_MISCExploitThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2018-16469
https://www.npmjs.com/advisories/722

Link	Providers	Tags
https://github.com/advisories/GHSA-f9cm-qmx5-m98h		Advisory
https://hackerone.com/reports/381194		x_refsource_MISCExploitThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2018-16469
https://www.npmjs.com/advisories/722