Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2026-26278

Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

Published: Feb 19, 2026 | Modified: Jul 21, 2026
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
7.5 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-26278
CWEhttps://cwe.mitre.org/data/definitions/776.html

fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible to make the parser spend seconds or even minutes processing a single request, effectively freezing the application. Version 5.3.6 fixes the issue. As a workaround, avoid using DOCTYPE parsing by processEntities: false option.

Weakness

The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities.

Affected Software

NameVendorStart VersionEnd Version
Fast-xml-parserNaturalintelligence4.1.3 (including)5.3.6 (excluding)
Red Hat Advanced Cluster Security 4.8RedHatadvanced-cluster-security/rhacs-main-rhel8:1775594119*
Red Hat Advanced Cluster Security 4.9RedHatadvanced-cluster-security/rhacs-main-rhel8:1775594284*
Red Hat Developer Hub 1.8RedHatrhdh/rhdh-hub-rhel9:1774545605*
Red Hat Developer Hub 1.9RedHatrhdh/rhdh-hub-rhel9:1775140647*
Red Hat Openshift Data Foundation 4.18RedHatodf4/cephcsi-rhel9:1783676191*
Red Hat Openshift Data Foundation 4.18RedHatodf4/cephcsi-rhel9-operator:1783929816*
Red Hat Openshift Data Foundation 4.18RedHatodf4/mcg-core-rhel9:1784094353*
Red Hat Openshift Data Foundation 4.18RedHatodf4/mcg-rhel9-operator:1784093953*
Red Hat Openshift Data Foundation 4.18RedHatodf4/ocs-client-console-rhel9:1784094943*
Red Hat Openshift Data Foundation 4.18RedHatodf4/ocs-client-rhel9-operator:1783676585*
Red Hat Openshift Data Foundation 4.18RedHatodf4/ocs-metrics-exporter-rhel9:1783676649*
Red Hat Openshift Data Foundation 4.18RedHatodf4/ocs-rhel9-operator:1783676675*
Red Hat Openshift Data Foundation 4.18RedHatodf4/odf-cli-rhel9:1784094299*
Red Hat Openshift Data Foundation 4.18RedHatodf4/odf-console-rhel9:1784094725*
Red Hat Openshift Data Foundation 4.18RedHatodf4/odf-cosi-sidecar-rhel9:1783676820*
Red Hat Openshift Data Foundation 4.18RedHatodf4/odf-csi-addons-rhel9-operator:1783676883*
Red Hat Openshift Data Foundation 4.18RedHatodf4/odf-csi-addons-sidecar-rhel9:1783676894*
Red Hat Openshift Data Foundation 4.18RedHatodf4/odf-multicluster-console-rhel9:1784095175*
Red Hat Openshift Data Foundation 4.18RedHatodf4/odf-multicluster-rhel9-operator:1783676977*
Red Hat Openshift Data Foundation 4.18RedHatodf4/odf-must-gather-rhel9:1784093503*
Red Hat Openshift Data Foundation 4.18RedHatodf4/odf-rhel9-operator:1783677297*
Red Hat Openshift Data Foundation 4.18RedHatodf4/odr-rhel9-operator:1783677345*
Red Hat Openshift Data Foundation 4.18RedHatodf4/rook-ceph-rhel9-operator:1783677533*
Red Hat Openshift Data Foundation 4.19RedHatodf4/cephcsi-rhel9:1783684360*
Red Hat Openshift Data Foundation 4.19RedHatodf4/cephcsi-rhel9-operator:1783684068*
Red Hat Openshift Data Foundation 4.19RedHatodf4/mcg-core-rhel9:1784054582*
Red Hat Openshift Data Foundation 4.19RedHatodf4/mcg-rhel9-operator:1784054606*
Red Hat Openshift Data Foundation 4.19RedHatodf4/ocs-client-console-rhel9:1784055295*
Red Hat Openshift Data Foundation 4.19RedHatodf4/ocs-client-rhel9-operator:1783684603*
Red Hat Openshift Data Foundation 4.19RedHatodf4/ocs-metrics-exporter-rhel9:1783684668*
Red Hat Openshift Data Foundation 4.19RedHatodf4/ocs-rhel9-operator:1783684667*
Red Hat Openshift Data Foundation 4.19RedHatodf4/odf-cli-rhel9:1784054873*
Red Hat Openshift Data Foundation 4.19RedHatodf4/odf-cloudnative-pg-rhel9-operator:1783684707*
Red Hat Openshift Data Foundation 4.19RedHatodf4/odf-console-rhel9:1784055589*
Red Hat Openshift Data Foundation 4.19RedHatodf4/odf-cosi-sidecar-rhel9:1783684779*
Red Hat Openshift Data Foundation 4.19RedHatodf4/odf-csi-addons-rhel9-operator:1783684831*
Red Hat Openshift Data Foundation 4.19RedHatodf4/odf-csi-addons-sidecar-rhel9:1783684839*
Red Hat Openshift Data Foundation 4.19RedHatodf4/odf-multicluster-console-rhel9:1784055533*
Red Hat Openshift Data Foundation 4.19RedHatodf4/odf-multicluster-rhel9-operator:1784055558*
Red Hat Openshift Data Foundation 4.19RedHatodf4/odf-must-gather-rhel9:1784056134*
Red Hat Openshift Data Foundation 4.19RedHatodf4/odf-rhel9-operator:1783685128*
Red Hat Openshift Data Foundation 4.19RedHatodf4/odr-rhel9-operator:1783685129*
Red Hat Openshift Data Foundation 4.19RedHatodf4/rook-ceph-rhel9-operator:1783685375*
Red Hat Openshift Data Foundation 4.2RedHatodf4/cephcsi-rhel9:1783667125*
Red Hat Openshift Data Foundation 4.2RedHatodf4/cephcsi-rhel9-operator:1783666755*
Red Hat Openshift Data Foundation 4.2RedHatodf4/mcg-core-rhel9:1784054598*
Red Hat Openshift Data Foundation 4.2RedHatodf4/mcg-rhel9-operator:1784055387*
Red Hat Openshift Data Foundation 4.2RedHatodf4/ocs-client-console-rhel9:1784055726*
Red Hat Openshift Data Foundation 4.2RedHatodf4/ocs-client-rhel9-operator:1783667517*
Red Hat Openshift Data Foundation 4.2RedHatodf4/ocs-metrics-exporter-rhel9:1783667577*
Red Hat Openshift Data Foundation 4.2RedHatodf4/ocs-rhel9-operator:1783667611*
Red Hat Openshift Data Foundation 4.2RedHatodf4/odf-cli-rhel9:1784055020*
Red Hat Openshift Data Foundation 4.2RedHatodf4/odf-cloudnative-pg-rhel9-operator:1783667641*
Red Hat Openshift Data Foundation 4.2RedHatodf4/odf-console-rhel9:1784055586*
Red Hat Openshift Data Foundation 4.2RedHatodf4/odf-cosi-sidecar-rhel9:1783667790*
Red Hat Openshift Data Foundation 4.2RedHatodf4/odf-csi-addons-rhel9-operator:1783667859*
Red Hat Openshift Data Foundation 4.2RedHatodf4/odf-csi-addons-sidecar-rhel9:1783667875*
Red Hat Openshift Data Foundation 4.2RedHatodf4/odf-external-snapshotter-rhel9-operator:1783667869*
Red Hat Openshift Data Foundation 4.2RedHatodf4/odf-external-snapshotter-sidecar-rhel9:1783667877*
Red Hat Openshift Data Foundation 4.2RedHatodf4/odf-multicluster-console-rhel9:1784055576*
Red Hat Openshift Data Foundation 4.2RedHatodf4/odf-multicluster-rhel9-operator:1784055244*
Red Hat Openshift Data Foundation 4.2RedHatodf4/odf-must-gather-rhel9:1784055382*
Red Hat Openshift Data Foundation 4.2RedHatodf4/odf-rhel9-operator:1783668266*
Red Hat Openshift Data Foundation 4.2RedHatodf4/odr-rhel9-operator:1783668288*
Red Hat Openshift Data Foundation 4.2RedHatodf4/rook-ceph-rhel9-operator:1783669219*
Node-webfontUbuntuquesting*

Potential Mitigations

References

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