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Fencer Intel
critical 9.8

CVE-2018-3750 json

Prototype Pollution in deep-extend

published 2018-07-03 8 y ago modified 2026-06-17 4 mo ago also GHSA-hr2v-3952-633q , EUVD-2018-0617

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

The utilities function in all versions <= 0.5.0 of the deep-extend node module can be tricked into modifying the prototype of Object when the attacker can control part of the structure passed to this function. This can let an attacker add or modify existing properties that will exist on all objects.

Patch / fix

  • npm deep-extend 0.5.1
  • node-deep-extend Debian 14, Debian 13, Debian 12 0.4.1-2

debian advisories DEBIAN-CVE-2018-3750

  • rh-nodejs12-nodejs RHEL 3 SOFTWARE_COLLECTIONS 12.20.1-1.el7
  • rh-nodejs12-npm RHEL 3 SOFTWARE_COLLECTIONS 6.14.10-12.20.1.1.el7
  • rh-nodejs12-nodejs-nodemon RHEL 3 SOFTWARE_COLLECTIONS 2.0.3-1.el7
  • npm RHEL 8 1:6.14.10-1.12.20.1.1.module+el8.3.0+9503+19cb079c
  • nodejs RHEL 8 1:12.20.1-1.module+el8.3.0+9503+19cb079c
  • nodejs-nodemon RHEL 8 2.0.3-1.module+el8.3.0+9715+1718613f
  • nodejs-full-i18n RHEL 8 1:12.20.1-1.module+el8.3.0+9503+19cb079c
  • nodejs-packaging RHEL 8 17-3.module+el8.1.0+3369+37ae6a45

red hat advisories RHSA-2021:0485RHSA-2021:0549RHSA-2020:2625

  • nodejs-nodemon AlmaLinux 8 2.0.3-1.module_el8.4.0+2521+c668cc9f
  • nodejs-packaging AlmaLinux 8 17-3.module_el8.4.0+2224+b07ac28e
  • nodejs-packaging AlmaLinux 8 17-3.module_el8.4.0+2521+c668cc9f
  • nodejs-packaging AlmaLinux 8 17-3.module_el8.3.0+2023+d2377ea3

almalinux advisories ALSA-2021:0549

  • nodejs-nodemon Rocky Linux 8 2.0.3-1.module+el8.6.0+982+9fdca2d4
  • nodejs-nodemon Rocky Linux 8 2.0.3-1.module+el8.3.0+100+234774f7
  • nodejs-nodemon Rocky Linux 8 2.0.3-1.module+el8.4.0+638+5344c6f7
  • nodejs-packaging Rocky Linux 8 17-3.module+el8.3.0+101+f84c7154

rocky linux advisories RLSA-2021:0549

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-2018-3750 updated cvss 4.2

nodejs-deep-extend: Prototype pollution can allow attackers to modify object properties

  • Red Hat Enterprise Linux 8 nodejs-nodemon
    affected: no fix available “Fix deferred”
  • Red Hat Software Collections rh-nodejs10-nodejs-nodemon, rh-nodejs4-nodejs-deep-extend, rh-nodejs6-nodejs-deep-extend
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) nodejs 12.20.1-1.module+el8.3.0+9503+19cb079c, nodejs-packaging 17-3.module+el8.1.0+3369+37ae6a45, nodejs-nodemon 2.0.3-1.module+el8.3.0+9715+1718613f, npm 6.14.10-1.12.20.1.1.module+el8.3.0+9503+19cb079c, nodejs-full-i18n 12.20.1-1.module+el8.3.0+9503+19cb079c
    fixed: vendor fix RHSA-2021:0549
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-nodejs8-nodejs 8.17.0-2.el7, rh-nodejs12-nodejs 12.20.1-1.el7, rh-nodejs8-npm 6.13.4-8.17.0.2.el7, rh-nodejs12-npm 6.14.10-12.20.1.1.el7, rh-nodejs12-nodejs-nodemon 2.0.3-1.el7 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-nodejs8-nodejs 8.17.0-2.el7, rh-nodejs12-nodejs 12.20.1-1.el7, rh-nodejs8-npm 6.13.4-8.17.0.2.el7, rh-nodejs12-npm 6.14.10-12.20.1.1.el7, rh-nodejs12-nodejs-nodemon 2.0.3-1.el7 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-nodejs8-nodejs 8.17.0-2.el7, rh-nodejs12-nodejs 12.20.1-1.el7, rh-nodejs8-npm 6.13.4-8.17.0.2.el7, rh-nodejs12-npm 6.14.10-12.20.1.1.el7, rh-nodejs12-nodejs-nodemon 2.0.3-1.el7 Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-nodejs8-nodejs 8.17.0-2.el7, rh-nodejs12-nodejs 12.20.1-1.el7, rh-nodejs8-npm 6.13.4-8.17.0.2.el7, rh-nodejs12-npm 6.14.10-12.20.1.1.el7, rh-nodejs12-nodejs-nodemon 2.0.3-1.el7
    fixed: vendor fix RHSA-2020:2625
  • Red Hat Mobile Application Platform 4 nodejs-deep-extend Red Hat OpenShift Enterprise 3 nodejs-deep-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

2.11% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • hackerone.com https://hackerone.com/reports/311333 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 deep-extend
<0.5.1
0.5.1

Classification

Weakness
  • CWE-20 Improper Input Validation

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.