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Fencer Intel
critical 9.8

CVE-2018-16491 json

Prototype Pollution in node.extend

published 7y ago modified 4mo ago also GHSA-r96c-57pf-9jjm , EUVD-2019-0337

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

A prototype pollution vulnerability was found in node.extend <1.1.7, ~<2.0.1 that allows an attacker to inject arbitrary properties onto Object.prototype.

Patch / fix

  • npm node.extend 1.1.7, 2.0.1
  • dreamerslab node.extend 1.1.7, 2.0.1
  • node-extend Debian 14, Debian 13, Debian 12 3.0.2-1

debian advisories DEBIAN-CVE-2018-16491

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-16491 updated cvss 4.8

nodejs-extend: Prototype pollution in Object.prototype

  • Red Hat Mobile Application Platform 4 nodejs-extend Red Hat OpenShift Container Platform 3.10 logging-kibana, logging-auth-proxy, jenkins-slave-nodejs Red Hat Software Collections rh-nodejs8-npm, rh-nodejs8-nodejs, rh-nodejs6-nodejs-extend
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.72% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • hackerone.com https://hackerone.com/reports/430831 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
npm node.extend
<1.1.7
>=2.0.0, <2.0.1
1.1.7
2.0.1

Affected products

  • HackerOne node.extend

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.