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Fencer Intel
medium 6.1

CVE-2026-41240 json

DOMPurify: FORBID_TAGS bypassed by function-based ADD_TAGS predicate (asymmetry with FORBID_ATTR fix)

published 6mo ago modified 14d ago also EUVD-2026-25238 , GHSA-h7mw-gpvr-xq4m

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

Summary

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions prior to 3.4.0 have an inconsistency between FORBID_TAGS and FORBID_ATTR handling when function-based ADD_TAGS is used. Commit c361baa added an early exit for FORBID_ATTR at line 1214. The same fix was not applied to FORBID_TAGS. At line 1118-1123, when EXTRA_ELEMENT_HANDLING.tagCheck returns true, the short-circuit evaluation skips the FORBID_TAGS check entirely. This allows forbidden elements to survive sanitization with their attributes intact. Version 3.4.0 patches the issue.

Patch / fix

  • npm dompurify 3.4.0
  • cure53 dompurify 3.4.0
  • node-dompurify Debian 14 3.4.1+dfsg-1

debian advisories DEBIAN-CVE-2026-41240

  • python3.12-pyjwt ansible automation platform 2.6 2.13.0-1.el9ap
  • python3.12-urllib3 ansible automation platform developer 2.6, ansible automation platform 2.6 2.7.0-1.el9ap
  • python3.12-pysequoia ansible automation platform 2.6 0.1.34-1.el9ap
  • automation-controller ansible automation platform developer 2.6, ansible automation platform 2.6 4.7.13-2.el9ap
  • automation-platform-ui ansible automation platform 2.6 2.6.10-1.el9ap
  • python3.12-pyjwt+crypto ansible automation platform 2.6 2.13.0-1.el9ap
  • automation-controller-ui ansible automation platform 2.6 4.7.13-2.el9ap
  • automation-controller-cli ansible automation platform developer 2.6, ansible automation platform 2.6 4.7.13-2.el9ap

red hat advisories RHSA-2026:34160

  • argocd-cli openSUSE Tumbleweed 3.4.3-1.1

opensuse advisories openSUSE-SU-2026:10888-1

Is CVE-2026-41240 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2026-41240 updated cvss 8.1

DOMPurify: DOMPurify: Cross-Site Scripting (XSS) via inconsistent tag sanitization

  • Red Hat Cryostat 4 cryostat-openshift-console-plugin-npm
    affected: workaround, no fix available
  • Red Hat Migration Toolkit for Virtualization mtv-candidate/mtv-console-plugin-rhel9 Red Hat 3scale API Management Platform 2 3scale-amp2/system-rhel8 Red Hat build of Apicurio Registry 2 dompurify
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Ceph Storage 9 rhceph/alloy-rhel10 Red Hat OpenShift AI (RHOAI) rhoai/odh-mod-arch-gen-ai-rhel9 Red Hat OpenShift Container Platform 4 openshift3/ose-console Red Hat Openshift Data Foundation 4 odf4/odf-console-rhel8, odf4/odf-console-rhel9, odf4/ocs-client-console-rhel9, odf4/odf-multicluster-console-rhel8, odf4/odf-multicluster-console-rhel9 Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9 Red Hat Self-service automation portal 2 ansible-automation-platform/automation-portal
    affected: workaround, no fix available
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-rhel9 4.2.0-10, cryostat/cryostat-openshift-console-plugin-rhel9 4.2.0-10
    fixed: vendor fix RHSA-2026:28010
  • Red Hat Ansible Automation Platform 2.6 for RHEL 9 automation-platform-ui 2.6.10-1.el9ap
    fixed: vendor fix RHSA-2026:34160
  • Red Hat build of Apicurio Registry 3.3.1
    fixed: vendor fix RHSA-2026:59360
  • Red Hat Ceph Storage 9.2 rhceph/rhceph-9-rhel10 1790843527
    fixed: vendor fix RHSA-2026:86618
  • Red Hat Container Native Virtualization 4.13 container-native-virtualization/kubevirt-console-plugin-rhel9 1782426816
    fixed: vendor fix RHSA-2026:36108
show 18 more
  • Red Hat Container Native Virtualization 4.14 container-native-virtualization/kubevirt-console-plugin-rhel9 1781807944
    fixed: vendor fix RHSA-2026:27944
  • Red Hat Container Native Virtualization 4.15 container-native-virtualization/kubevirt-console-plugin-rhel9 1782917983
    fixed: vendor fix RHSA-2026:36107
  • Red Hat Container Native Virtualization 4.17 container-native-virtualization/kubevirt-console-plugin-rhel9 1781822441
    fixed: vendor fix RHSA-2026:28001
  • Red Hat Container Native Virtualization 4.18 container-native-virtualization/kubevirt-console-plugin-rhel9 1781808146
    fixed: vendor fix RHSA-2026:27875
  • Red Hat Container Native Virtualization 4.19 container-native-virtualization/kubevirt-console-plugin-rhel9 1781821991
    fixed: vendor fix RHSA-2026:27872
  • Red Hat Container Native Virtualization 4.20 container-native-virtualization/kubevirt-console-plugin-rhel9 1781824266
    fixed: vendor fix RHSA-2026:27967
  • Red Hat Container Native Virtualization 4.21 container-native-virtualization/kubevirt-console-plugin-rhel9 1781738713
    fixed: vendor fix RHSA-2026:27879
  • Red Hat Data Grid 8.6.1
    fixed: vendor fix RHSA-2026:22619
  • Red Hat Developer Hub 1.8 rhdh/rhdh-hub-rhel9 1779841586
    fixed: vendor fix RHSA-2026:21338
  • Red Hat OpenShift AI 2.25 rhoai/odh-dashboard-rhel9 1780467029, rhoai/odh-mod-arch-model-registry-rhel9 1780467147
    fixed: vendor fix RHSA-2026:24977
  • Red Hat OpenShift Dev Spaces 3.28 devspaces/code-rhel9 1779814592, devspaces/openvsx-rhel9 1779528224
    fixed: vendor fix RHSA-2026:21772
  • Red Hat OpenShift Service Mesh 2.6 openshift-service-mesh 1778191473
    fixed: vendor fix RHSA-2026:16476
  • Red Hat Streams for Apache Kafka 2.9.4
    fixed: vendor fix RHSA-2026:34608
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-db-rhel9 4.2.0-16, cryostat/jfr-datasource-rhel9 4.2.0-10, cryostat/cryostat-reports-rhel9 4.2.0-10, cryostat/cryostat-storage-rhel9 4.2.0-16, cryostat/cryostat-operator-bundle 4.2.0-8, cryostat/cryostat-rhel9-operator 4.2.0-15, +2 more Red Hat Migration Toolkit for Virtualization migration-toolkit-virtualization/mtv-console-plugin-rhel9
    not affected: vulnerable code not present
  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/console-mce-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-rhel9-operator, workload-availability/node-healthcheck-operator-bundle, workload-availability/node-healthcheck-must-gather-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-console-plugin-rhel9, openshift-lightspeed/lightspeed-console-plugin-419-rhel9 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/kiali-rhel9, openshift-service-mesh/kiali-ossmc-rhel9
    not affected: vulnerable code not present
  • Red Hat 3scale API Management Platform 2 3scale-amp21/system, 3scale-amp22/system, 3scale-amp2/system-rhel7, 3scale-amp2/system-rhel9
    not affected: component not present
  • Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8 Red Hat Ansible Automation Platform 2 automation-gateway, automation-controller, automation-eda-controller, ansible-automation-platform-26/gateway-rhel9 Red Hat Ansible Automation Platform 2.6 for RHEL 9 automation-hub 4.11.10-1.el9ap, python3.12-pyjwt 2.13.0-1.el9ap, python3.12-urllib3 2.7.0-1.el9ap, python3.12-pysequoia 0.1.34-1.el9ap, automation-controller 4.7.13-2.el9ap, python3.12-galaxy-ng 4.11.10-1.el9ap, +26 more Red Hat build of Apache Camel - HawtIO 4 dompurify Red Hat Build of Podman Desktop rh-podman-desktop.git
    not affected: vulnerable code not present

14 more not affected in the full advisory

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
6mo ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/cure53/DOMPurify/security/advisories/GHSA-h7mw-gpvr-xq4m referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CNA 4.0 6.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/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
NVD 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 dompurify
<3.4.0
3.4.0

Affected products

  • cure53 DOMPurify

Classification

Weakness
  • CWE-183 Permissive List of Allowed Inputs
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel 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.