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Fencer Vulns
medium 5.6

CVE-2021-23434 json

Prototype Pollution

published 2021-08-27 5 y ago modified 2026-06-17 4 mo ago also GHSA-v39p-96qg-c8rf , EUVD-2021-2112

cvss
5.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

This affects the package object-path before 0.11.6. A type confusion vulnerability can lead to a bypass of CVE-2020-15256 when the path components used in the path parameter are arrays. In particular, the condition currentPath === '__proto__' returns false if currentPath is ['__proto__']. This is because the === operator returns always false when the type of the operands is different.

Patch / fix

  • npm object-path 0.11.6
  • n/a object-path 0.11.6
  • node-object-path Debian 14, Debian 13, Debian 12 0.11.7-1

debian advisories DEBIAN-CVE-2021-23434

  • node-object-path Ubuntu 18.04 LTS 0.11.3-1ubuntu0.1
  • node-object-path Ubuntu 20.04 LTS 0.11.4-2ubuntu0.1

ubuntu advisories UBUNTU-CVE-2021-23434

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

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-2021-23434 updated cvss 8.6

object-path: Type confusion vulnerability can lead to a bypass of CVE-2020-15256

  • Red Hat OpenShift Service Mesh 1 servicemesh-prometheus
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Service Mesh 2.0 servicemesh-prometheus Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/grc-ui-rhel8, rhacm2/search-ui-rhel8, rhacm2/grc-ui-api-rhel8, rhacm2/search-api-rhel8, rhacm2/application-ui-rhel8, rhtas/rekor-search-ui-rhel9, +1 more
    affected: no fix available
  • Red Hat JBoss Data Grid 7 container-native-virtualization/kubevirt-console-plugin Red Hat OpenShift Container Platform 4 openshift4/ose-prometheus, openshift4/ose-thanos-rhel8
    affected: no fix planned “Out of support scope”
  • Red Hat Service Telemetry Framework 1.2 for RHEL 8 stf/smart-gateway-rhel8-operator, stf/service-telemetry-rhel8-operator
    affected: no fix planned “Will not fix”

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

1.90% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • snyk.io https://snyk.io/vuln/SNYK-JS-OBJECTPATH-1569453 referenced PoC, tagged "exploit" by a source, unverified
  • snyk.io https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1570423 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.6 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.1 5.6 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem package affected fixed in
npm object-path
<0.11.6
0.11.6

Affected products

  • n/a object-path

Classification

Weakness
  • CWE-843 Access of Resource Using Incompatible Type
  • CWE-1321 Improperly Controlled Modification of Object Prototype 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.