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Fencer Vulns
high 8.7

CVE-2026-73569 json

fast-xml-parser: Repeated DOCTYPE declarations reset entity expansion limits

published 2026-07-21 3 mo ago modified 2026-10-24 16 d ago also EUVD-2026-58184 , GHSA-8r6m-32jq-jx6q

cvss
8.7
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. From 5.9.3 until 5.10.1, src/xmlparser/OrderedObjParser.js processes multiple DOCTYPE declarations within a single XML document and passes each declaration's entities through addInputEntities(). addInputEntities() resets maxTotalExpansions and maxExpandedLength every time it is called, allowing additional DOCTYPE declarations to repeatedly reset the configured entity-expansion limits during one parse operation. A crafted XML document can then cause excessive CPU use, event-loop blocking, memory exhaustion, and process termination. This issue is fixed in version 5.10.1.

Patch / fix

  • npm fast-xml-parser 5.10.1
  • fast-xml-parser_project fast-xml-parser 5.10.1
  • naturalintelligence fast_xml_parser 5.10.1

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-2026-73569 updated cvss 7.5

fast-xml-parser: fast-xml-parser: Denial of Service via repeated DOCTYPE declarations

  • Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Ansible Automation Platform 2.2 ansible-automation-platform/bootc-automation-portal-rhel9 1788943531
    fixed: vendor fix RHSA-2026:66003
  • Red Hat Migration Toolkit for Applications 8.2 mta/mta-ui-rhel9 1789446780
    fixed: vendor fix RHSA-2026:67724
  • Red Hat Openshift Data Foundation 4.19 odf4/odf-console-rhel9 1793126829
    fixed: vendor fix RHSA-2026:92650
  • Red Hat Openshift Data Foundation 4.22 odf4/cephcsi-rhel9 1788162216, odf4/odf-cli-rhel9 1788163238, odf4/mcg-core-rhel9 1788162644, odf4/odf-drbd-rhel9 1788163607, odf4/odf-console-rhel9 1788164027, odf4/devicefinder-rhel9 1788162237, +22 more
    fixed: vendor fix RHSA-2026:65130
  • Red Hat Cryostat 4 cryostat/cryostat-openshift-console-plugin-rhel9 Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8, advanced-cluster-security/rhacs-main-rhel9 Red Hat build of Apicurio Registry 3 apicurio/apicurio-registry-ui-rhel8 Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9, rhdh/red-hat-developer-hub-backstage-plugin-lightspeed, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator, rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-form-widgets, +2 more Red Hat Migration Toolkit for Applications 8.2 mta/mta-cli-rhel9 1789505976, mta/mta-hub-rhel9 1789497768, mta/mta-rhel9-operator 1789505238, mta/mta-operator-bundle 1789507078, mta/mta-analyzer-addon-rhel9 1789497785, mta/mta-platform-addon-rhel9 1789496952, +7 more Red Hat Openshift Data Foundation 4.19 odf4/cephcsi-rhel9 1793125678, odf4/odf-cli-rhel9 1793126086, odf4/mcg-core-rhel9 1793125866, odf4/mcg-rhel9-operator 1793125881, odf4/ocs-rhel9-operator 1793126016, odf4/odf-rhel9-operator 1793126364, +26 more
    +4 more products
    Red Hat Openshift Data Foundation 4.22 odf4/mcg-operator-bundle 1788169617, odf4/ocs-operator-bundle 1788169897, odf4/odf-operator-bundle 1788170150, odf4/cephcsi-operator-bundle 1788169582, odf4/odr-hub-operator-bundle 1788170252, odf4/rook-ceph-operator-bundle 1788170507, +10 more Red Hat OpenShift GitOps microshift-gitops 1.19.2-36.el9, openshift-gitops-argocd-cli 1.19.2-36.el9 Red Hat OpenShift Virtualization 4 container-native-virtualization/kubevirt-console-plugin, container-native-virtualization/kubevirt-console-plugin-rhel9 Red Hat Self-service automation portal 2 ansible-automation-platform/automation-portal
    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
none
Automatable
yes
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
npm fast-xml-parser
>=5.9.3, <5.10.1
5.10.1

Affected products

  • NaturalIntelligence fast-xml-parser

Classification

Weakness
  • CWE-776 Improper Restriction of Recursive Entity References in DTDs

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.