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Fencer Vulns
medium 5.3

CVE-2023-0842 json

xml2js 0.4.23 - Prototype Pollution

published 2023-04-05 3 y ago modified 2026-06-17 4 mo ago also GHSA-776f-qx25-q3cc , EUVD-2023-1222

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

xml2js version 0.4.23 allows an external attacker to edit or add new properties to an object. This is possible because the application does not properly validate incoming JSON keys, thus allowing the __proto__ property to be edited.

Patch / fix

  • npm xml2js 0.5.0
  • node-xml2js Debian 14, Debian 13, Debian 12 0.4.23+~cs15.4.0+dfsg-7

debian advisories DEBIAN-CVE-2023-0842

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-2023-0842 updated cvss 5.3

node-xml2js: xml2js is vulnerable to prototype pollution

  • Red Hat OpenShift Service Mesh 2 openshift-service-mesh/kiali-rhel8 Red Hat OpenShift Service Mesh 2.1 openshift-service-mesh/kiali-rhel8 Red Hat Data Grid 8 xml2js
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 6 firefox Red Hat Enterprise Linux 7 firefox Red Hat Fuse 7 node-xml2js node-xml2js Red Hat OpenShift Container Platform 3.11 openshift3/ose-console Red Hat Openshift Container Storage 4 ocs4/mcg-core-rhel8
    affected: no fix planned “Out of support scope”
  • Red Hat Openshift Data Foundation 4 odf4/mcg-core-rhel8, noobaa-core-container Red Hat OpenShift Data Science (RHODS) rhods/odh-dashboard-rhel8
    affected: no fix available
  • Red Hat OpenShift Dev Spaces devspaces/code-rhel8, devspaces-theia-rhel8-container
    affected: no fix planned “Will not fix”
  • Red Hat Quay 3 quay/quay-rhel8
    affected: no fix available
  • Red Hat A-MQ Online node-xml2js node-xml2js Red Hat Enterprise Linux 8 mozjs60 Red Hat Enterprise Linux 9 gjs, polkit, polkit-libs Red Hat OpenShift Container Platform 4 openshift4/ose-console
    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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
20 mo ago

Exploit prediction

1.39% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • fluidattacks.com https://fluidattacks.com/advisories/myers/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm xml2js
<0.5.0
0.5.0

Affected products

  • n/a xml2js

Classification

Weakness
  • 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.