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Fencer Vulns
medium 6.1

CVE-2026-41650 json

fast-xml-parser XMLBuilder: XML Comment and CDATA Injection via Unescaped Delimiters

published 2026-04-22 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-28381 , GHSA-gh4j-gqv2-49f6

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. Prior to version 5.7.0, XMLBuilder does not escape the "-->" sequence in comment content or the "]]>" sequence in CDATA sections when building XML from JavaScript objects. This allows XML injection when user-controlled data flows into comments or CDATA elements, leading to XSS, SOAP injection, or data manipulation. This issue has been patched in version 5.7.0.

Patch / fix

  • npm fast-xml-parser 5.7.0
  • fast-xml-parser_project fast-xml-parser 5.7.0
  • naturalintelligence fast-xml-parser 5.7.0
  • naturalintelligence fast_xml_parser 5.7.0
  • velociraptor openSUSE Tumbleweed 0.76.7.0.git145.b60ef1146-1.1

opensuse advisories openSUSE-SU-2026:12070-1

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-2026-41650 updated cvss 5.4

fast-xml-parser: fast-xml-parser: XML injection via improper escaping of comment and CDATA sequences

  • Red Hat Cryostat 4 cryostat-openshift-console-plugin-npm Red Hat Migration Toolkit for Applications 8 mta/mta-ui-rhel8, mta/mta-ui-rhel9 Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8 Red Hat build of Apicurio Registry 3 apicurio/apicurio-registry-ui-rhel8, apicurio/apicurio-registry-ui-rhel9 Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9 Red Hat Openshift Data Foundation 4 odf4/mcg-core-rhel8
    +4 more products
    Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9 Red Hat OpenShift Virtualization 4 container-native-virtualization/kubevirt-console-plugin, container-native-virtualization/kubevirt-console-plugin-rhel9 Red Hat Satellite 6 satellite/iop-vulnerability-frontend-rhel9 Red Hat Self-service automation portal 2 ansible-automation-platform/automation-portal
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Openshift Data Foundation 4.18 odf4/cephcsi-rhel9 1786705347, odf4/odf-cli-rhel9 1786705938, odf4/mcg-core-rhel9 1786705558, odf4/odf-console-rhel9 1786706577, odf4/mcg-rhel9-operator 1786705646, odf4/ocs-rhel9-operator 1786705802, +13 more
    fixed: vendor fix RHSA-2026:56431
  • Red Hat Openshift Data Foundation 4.22 odf4/cephcsi-rhel9 1787057250, odf4/odf-cli-rhel9 1787058706, odf4/mcg-core-rhel9 1787058450, odf4/odf-drbd-rhel9 1787059538, odf4/odf-console-rhel9 1787059072, odf4/devicefinder-rhel9 1787057603, +22 more
    fixed: vendor fix RHSA-2026:56928
  • Red Hat Openshift Data Foundation 4.18 odf4/mcg-operator-bundle 1786708633, odf4/ocs-operator-bundle 1786708778, odf4/odf-operator-bundle 1786709119, odf4/cephcsi-operator-bundle 1786708508, odf4/odr-hub-operator-bundle 1786709184, odf4/rook-ceph-operator-bundle 1786709254, +7 more Red Hat Openshift Data Foundation 4.22 odf4/mcg-operator-bundle 1787065167, odf4/ocs-operator-bundle 1787066001, odf4/odf-operator-bundle 1787066421, odf4/cephcsi-operator-bundle 1787065131, odf4/odr-hub-operator-bundle 1787066815, odf4/rook-ceph-operator-bundle 1787067321, +10 more
    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
no
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-gh4j-gqv2-49f6 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
GitHub 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm fast-xml-parser
<5.7.0
5.7.0

Affected products

  • NaturalIntelligence fast-xml-parser

Classification

Weakness

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.