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Fencer Vulns
medium 6.1

CVE-2026-44665 json

fast-xml-builder: Attribute values with unwanted quotes can bypass malicious or unwanted attributes

published 2026-05-08 6 mo ago modified 2026-10-26 13 d ago also GHSA-5wm8-gmm8-39j9 , EUVD-2026-30053

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-builder builds XML from JSON. Prior to 1.1.7, when an input data has quotes in attribute values but process entities is not enabled, it breaks the attribute value into multiple attributes. This gives the room for an attacker to insert unwanted attributes to the XML/HTML. This vulnerability is fixed in 1.1.7.

Patch / fix

  • npm fast-xml-builder 1.1.7

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-2026-44665 updated cvss 6.1

fast-xml-builder: fast-xml-builder: Attribute injection leading to information disclosure or content manipulation

  • Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8
    affected: no fix planned “Out of support scope”
  • Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift Virtualization 4 container-native-virtualization/kubevirt-console-plugin-rhel9
    affected: no fix planned “Out of support scope”
  • Red Hat Self-service automation portal 2 ansible-automation-platform/automation-portal
    affected: no fix available “Fix deferred”
  • 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 4.22 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 Red Hat OpenShift Virtualization 4 container-native-virtualization/kubevirt-console-plugin
    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
5 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-builder/security/advisories/GHSA-5wm8-gmm8-39j9 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-builder
<1.1.7
1.1.7

Affected products

  • NaturalIntelligence fast-xml-builder

Classification

Weakness
  • CWE-91 XML Injection
  • CWE-611 Improper Restriction of XML External Entity Reference

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.