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Fencer Vulns
critical 9.8

CVE-2021-3918 json

Prototype Pollution in kriszyp/json-schema

published 2021-11-13 4 y ago modified 2026-06-17 4 mo ago also GHSA-896r-f27r-55mw , EUVD-2021-2320

cvss
9.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.8%
EPSS 3.8% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

json-schema is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Patch / fix

  • npm json-schema 0.4.0
  • json-schema_project json-schema 0.4.0
  • node-json-schema Debian 14, Debian 13, Debian 12 0.4.0+~7.0.9-1

debian advisories DEBIAN-CVE-2021-3918

  • node-json-schema Ubuntu 18.04 LTS 0.2.3-1+deb10u1build0.18.04.1
  • node-json-schema Ubuntu 20.04 LTS 0.2.3-1+deb10u1build0.20.04.1

ubuntu advisories UBUNTU-CVE-2021-3918

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • npm RHEL 8 1:6.14.15-1.14.18.2.2.module+el8.5.0+13644+8d46dafd
  • nodejs RHEL 8 1:14.18.2-2.module+el8.5.0+13644+8d46dafd
  • nodejs-nodemon RHEL 8 2.0.15-1.module+el8.5.0+13504+a2e74d91
  • nodejs-full-i18n RHEL 8 1:14.18.2-2.module+el8.5.0+13644+8d46dafd
  • nodejs-packaging RHEL 8, RHEL 8.4 EUS 23-3.module+el8.3.0+6519+9f98ed83
  • npm RHEL 8 1:8.1.2-1.16.13.1.3.module+el8.5.0+13548+45d748af
  • nodejs RHEL 8 1:16.13.1-3.module+el8.5.0+13548+45d748af
  • nodejs-nodemon RHEL 8 2.0.15-1.module+el8.5.0+13548+45d748af

red hat advisories RHSA-2022:0350RHSA-2021:5171RHSA-2022:0246RHEA-2022:5139RHEA-2022:5221RHEA-2022:5615

  • grafana SLE Module for Package Hub 15 SP5, openSUSE Leap 15.5 9.5.8-150200.3.53.2
  • grafana Manager Client Tools 15 9.5.8-150000.1.60.2
  • spacecmd openSUSE Leap 15.5, Manager Client Tools 15 4.3.26-150000.3.113.1
  • mgr-daemon Manager Client Tools 15 4.3.8-150000.1.44.1
  • spacewalk-client-tools Manager Client Tools 15 4.3.18-150000.3.86.2
  • prometheus-postgres_exporter openSUSE Leap 15.5, Manager Client Tools 15 0.10.1-150000.1.17.1
  • uyuni-proxy-systemd-services Manager Client Tools for SLE Micro 5, Manager Client Tools 15 4.3.10-150000.1.15.1
  • golang-github-prometheus-prometheus Manager Client Tools 15 2.45.0-150000.3.53.1

suse advisories SUSE-RU-2024:0511-1SUSE-SU-2024:0487-1SUSE-SU-2024:0486-1SUSE-SU-2024:0196-1SUSE-SU-2024:0191-1SUSE-SU-2023:2579-1

  • grafana openSUSE Tumbleweed 9.3.6-1.1
  • nodejs14 openSUSE Leap 15.3 14.19.0-15.27.1
  • nodejs8 openSUSE Leap 15.3 8.17.0-10.19.2
  • nodejs12 openSUSE Leap 15.3 12.22.10-4.29.3

opensuse advisories openSUSE-SU-2024:12723-1openSUSE-SU-2022:0715-1openSUSE-SU-2022:0704-1openSUSE-SU-2022:0657-1

  • npm AlmaLinux 8 1:6.14.15-1.14.18.2.2.module_el8.5.0+2618+8d46dafd
  • npm AlmaLinux 8 1:6.14.15-1.14.18.2.2.module_el8.5.0+254+b4526b16
  • nodejs AlmaLinux 8 1:14.18.2-2.module_el8.5.0+2618+8d46dafd
  • nodejs AlmaLinux 8 1:14.18.2-2.module_el8.5.0+254+b4526b16
  • nodejs-nodemon AlmaLinux 8 2.0.15-1.module_el8.6.0+2904+f21ad6f4
  • nodejs-nodemon AlmaLinux 8 2.0.15-1.module_el8.5.0+2605+45d748af
  • nodejs-nodemon AlmaLinux 8 2.0.15-1.module_el8.5.0+2618+8d46dafd
  • nodejs-full-i18n AlmaLinux 8 1:14.18.2-2.module_el8.5.0+2618+8d46dafd

almalinux advisories ALSA-2022:0350ALSA-2021:5171

  • nodejs Rocky Linux 8 1:14.18.2-2.module+el8.5.0+733+de4fee6c
  • nodejs-nodemon Rocky Linux 8 2.0.15-1.module+el8.5.0+721+4c107270
  • nodejs-packaging Rocky Linux 8 23-3.module+el8.7.0+1071+4bdda2a8
  • nodejs-packaging Rocky Linux 8 23-3.module+el8.3.0+100+234774f7
  • nodejs-packaging Rocky Linux 8 23-3.module+el8.5.0+733+de4fee6c
  • nodejs Rocky Linux 8 1:16.13.1-3.module+el8.5.0+721+4c107270
  • nodejs-packaging Rocky Linux 8 25-1.module+el8.6.0+1046+80feca58
  • nodejs-packaging Rocky Linux 8 25-1.module+el8.5.0+702+221f14e6

rocky linux advisories RLSA-2022:0350RLSA-2021:5171

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-2021-3918 updated cvss 9.8

nodejs-json-schema: Prototype pollution vulnerability

  • Red Hat Migration Toolkit for Virtualization migration-toolkit-virtualization/mtv-ui-rhel8
    affected: no fix planned “Will not fix”
  • Red Hat OpenShift Service Mesh 2.0 servicemesh-grafana, servicemesh-prometheus, servicemesh-grafana-prometheus Red Hat OpenShift Service Mesh 2.1 servicemesh-grafana, servicemesh-prometheus, openshift-service-mesh/kiali-rhel8
    affected: no fix available
  • Red Hat Advanced Cluster Management for Kubernetes 2 grc-ui-container, rhacm2/console-api, rhacm2/grc-ui-rhel8, grc-ui-api-container, rhacm2/console-rhel8, rhacm2/search-ui-rhel8, +5 more
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 4 openshift4/ose-grafana, openshift4/ose-thanos-rhel9, openshift4/ose-prometheus-rhel9 Red Hat Openshift Data Foundation 4 odf4/mcg-core-rhel8, odf4/odf-console-rhel9
    affected: no fix planned “Will not fix”
  • Red Hat OpenShift distributed tracing 2 rhosdt/jaeger-query-rhel8
    affected: no fix available
  • Red Hat Quay 3 quay/quay-rhel8
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) nodejs 14.18.2-2.module+el8.5.0+13644+8d46dafd, nodejs 16.13.1-3.module+el8.5.0+13548+45d748af, nodejs 12.22.12-1.module+el8.6.0+15324+1f2c5d8d, nodejs-packaging 17-3.module+el8.1.0+3369+37ae6a45, nodejs-packaging 23-3.module+el8.3.0+6519+9f98ed83, nodejs-packaging 25-1.module+el8.5.0+10992+fac5fe06, +9 more
    fixed: vendor fix RHSA-2022:0350
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) nodejs 12.22.12-1.module+el8.1.0+15296+87b2f6ad, nodejs-packaging 17-3.module+el8.1.0+3369+37ae6a45, nodejs-nodemon 1.18.3-1.module+el8.1.0+3369+37ae6a45, npm 6.14.16-1.12.22.12.1.module+el8.1.0+15296+87b2f6ad, nodejs-full-i18n 12.22.12-1.module+el8.1.0+15296+87b2f6ad
    fixed: vendor fix RHEA-2022:4925
show 4 more
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) nodejs 12.22.12-1.module+el8.2.0+15322+a70ca0ab, nodejs-packaging 17-3.module+el8.1.0+3369+37ae6a45, nodejs-nodemon 1.18.3-1.module+el8.1.0+3369+37ae6a45, npm 6.14.16-1.12.22.12.1.module+el8.2.0+15322+a70ca0ab, nodejs-full-i18n 12.22.12-1.module+el8.2.0+15322+a70ca0ab
    fixed: vendor fix RHEA-2022:5221
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) nodejs 14.18.2-2.module+el8.4.0+13643+6c0ebf22, nodejs 12.22.12-1.module+el8.4.0+15323+4d1cc445, nodejs-packaging 17-3.module+el8.1.0+3369+37ae6a45, nodejs-packaging 23-3.module+el8.3.0+6519+9f98ed83, nodejs-nodemon 2.0.3-1.module+el8.4.0+11732+c668cc9f, nodejs-nodemon 2.0.15-1.module+el8.4.0+13503+fc29810b, +4 more
    fixed: vendor fix RHEA-2022:5615
  • Red Hat Software Collections for RHEL Workstation(v. 7) rh-nodejs14-nodejs 14.18.2-1.el7, rh-nodejs12-nodejs 12.22.12-2.el7, rh-nodejs14-npm 6.14.15-14.18.2.1.el7, rh-nodejs12-npm 6.14.16-12.22.12.2.el7, rh-nodejs14-nodejs-nodemon 2.0.3-6.el7 Red Hat Software Collections for RHEL(v. 7) rh-nodejs14-nodejs 14.18.2-1.el7, rh-nodejs12-nodejs 12.22.12-2.el7, rh-nodejs14-npm 6.14.15-14.18.2.1.el7, rh-nodejs12-npm 6.14.16-12.22.12.2.el7, rh-nodejs14-nodejs-nodemon 2.0.3-6.el7
    fixed: vendor fix RHSA-2022:4914
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/kibana6-rhel8 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/kui-web-terminal-rhel8 Red Hat Enterprise Linux 9 npm, nodejs, nodejs-libs, nodejs-full-i18n Red Hat OpenShift Application Runtimes vertx-json-schema
    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

3.83% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • huntr.dev https://huntr.dev/bounties/bb6ccd63-f505-4e3a-b55f-cd2662c261a9 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/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 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
npm json-schema
<0.4.0
0.4.0

Affected products

  • kriszyp kriszyp/json-schema

Classification

Weakness
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
  • CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes

References

Sources

Fencer Vulns 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.