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Fencer Vulns
medium 6.1

CVE-2026-25681 json

Invoking incorrect handling of character references in DOCTYPE nodes in golang.org/x/net/html

published 2026-05-22 5 mo ago modified 2026-09-22 48 d ago also EUVD-2026-31452 , GO-2026-5029

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 13%
public exploits
0
none known

Summary

Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.

Patch / fix

  • go golang.org/x/net 0.55.0
  • golang.org/x/net golang.org/x/net/html 0.55.0
  • golang-golang-x-net Debian 14 1:0.55.0-1

debian advisories DEBIAN-CVE-2026-25681

  • osbuild-composer RHEL 9 165.1-5.el9_8
  • osbuild-composer-core RHEL 9 165.1-5.el9_8
  • osbuild-composer-worker RHEL 9 165.1-5.el9_8
  • flightctl edge manager 1.1 1.1.4-1.el10em
  • flightctl edge manager 1.1 1.1.4-1.el9em
  • flightctl-cli edge manager 1.1 1.1.4-1.el10em
  • flightctl-cli edge manager 1.1 1.1.4-1.el9em
  • flightctl-agent edge manager 1.1 1.1.4-1.el10em

red hat advisories RHSA-2026:69293RHSA-2026:68334RHSA-2026:67517RHSA-2026:67138RHSA-2026:67139RHSA-2026:66432

  • containerized-data-importer SLE Module for Containers 15 SP7 1.64.0-150700.9.14.1
  • grafana SLE Module for Package Hub 15 SP7 12.4.5-150200.3.91.1
  • kubevirt-1.6 SLE Module for Containers 15 SP7 1.6.6-150700.15.17.1
  • kubevirt SLE Module for Containers 15 SP7 1.7.4-150700.3.30.1
  • terraform-provider-aws SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 3.11.0-150200.6.18.1
  • terraform-provider-tls SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 3.0.0-150200.5.15.1
  • terraform-provider-helm SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 2.9.0-150200.6.23.1
  • terraform-provider-null SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 3.0.0-150200.6.18.1

suse advisories SUSE-SU-2026:4209-1SUSE-SU-2026:3718-1SUSE-SU-2026:3630-1SUSE-SU-2026:3203-1SUSE-SU-2026:3056-1SUSE-SU-2026:22613-1

  • percona-toolkit openSUSE Tumbleweed 3.7.1.4-1.1
  • containerized-data-importer1.65 openSUSE Leap 16.0 1.65.0-160000.3.1
  • glab openSUSE Leap 16.0 1.114.0-bp160.1.1
  • kubevirt1.8 openSUSE Leap 16.0 1.8.4-160000.1.1
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • rclone openSUSE Leap 16.0 1.74.4-bp160.1.1
  • lux openSUSE Leap 16.0 0.24.1-bp160.1.1
  • gomuks openSUSE Tumbleweed 26.03+git.1780250926.564a8707-1.1

opensuse advisories openSUSE-SU-2026:12166-1openSUSE-SU-2026:21824-1openSUSE-SU-2026:21662-1openSUSE-SU-2026:21590-1openSUSE-SU-2026:21483-1openSUSE-SU-2026:21436-1

  • osbuild-composer AlmaLinux 9 165.1-5.el9_8.alma.1
  • osbuild-composer-core AlmaLinux 9 165.1-5.el9_8.alma.1
  • osbuild-composer-worker AlmaLinux 9 165.1-5.el9_8.alma.1
  • osbuild-composer AlmaLinux 10 165.1-5.el10_2.alma.1
  • osbuild-composer-core AlmaLinux 10 165.1-5.el10_2.alma.1
  • osbuild-composer-worker AlmaLinux 10 165.1-5.el10_2.alma.1
  • podman AlmaLinux 9 6:5.8.2-4.el9_8
  • podman-tests AlmaLinux 9 6:5.8.2-4.el9_8

almalinux advisories ALSA-2026:69293ALSA-2026:66432ALSA-2026:37123ALSA-2026:35827ALSA-2026:35828ALSA-2026:34357

  • osbuild-composer Rocky Linux 9 165.1-5.el9_8.rocky.0.1
  • image-builder Rocky Linux 9 52.1-2.el9_8
  • image-builder Rocky Linux 10 52.1-2.el10_2.rocky.0.1
  • osbuild-composer Rocky Linux 10 165.1-5.el10_2.rocky.0.1
  • podman Rocky Linux 10 7:5.8.2-4.el10_2
  • podman Rocky Linux 9 6:5.8.2-4.el9_8
  • opentelemetry-collector Rocky Linux 10 0.152.1-1.el10_2
  • opentelemetry-collector Rocky Linux 9 0.152.1-1.el9_8

rocky linux advisories RLSA-2026:69293RLSA-2026:67138RLSA-2026:67139RLSA-2026:66432RLSA-2026:37072RLSA-2026:37123

  • application-gateway-kubernetes-ingress Azure Linux 3.0 1.7.7-5
  • cert-manager Azure Linux 3.0 1.12.15-9
  • cf-cli Azure Linux 3.0 8.7.11-7
  • cloud-provider-kubevirt Azure Linux 3.0 0.5.1-5
  • cni-plugins Azure Linux 3.0 1.4.0-6
  • containerd2 Azure Linux 3.0 2.2.4-4
  • containerized-data-importer Azure Linux 3.0 1.62.0-6
  • cri-tools Azure Linux 3.0 1.32.0-6

azure linux advisories AZL-87378AZL-87435AZL-87480AZL-87492AZL-87516AZL-87540

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2026-25681 updated cvss 8.1

golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-rhel9, rhai/assisted-installer-agent-rhel9, rhai/assisted-installer-controller-rhel9, assisted/agent-preinstall-image-builder-rhel9 Red Hat cert-manager Operator for Red Hat OpenShift cert-manager/cert-manager-trust-manager-rhel9 Red Hat Compliance Operator compliance/openshift-compliance-operator-bundle
    affected: workaround, no fix available
  • Red Hat Confidential Compute Attestation openshift-sandboxed-containers/osc-rhel9-operator, openshift-sandboxed-containers/osc-podvm-payload-rhel9, openshift-sandboxed-containers/osc-cloud-api-adaptor-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Cryostat 4 cryostat/cryostat-rhel9-operator, cryostat/cryostat-grafana-dashboard-rhel9
    affected: workaround, no fix available
  • Red Hat External Secrets Operator for Red Hat OpenShift external-secrets-operator/external-secrets-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Fence Agents Remediation Operator workload-availability/fence-agents-remediation-rhel8-operator, workload-availability/fence-agents-remediation-operator-bundle, redhat-user-workloads/rhwa-tenant/fence-agents-remediation/far-operator-0-8 Red Hat File Integrity Operator compliance/openshift-compliance-operator-bundle, compliance/openshift-file-integrity-rhel8-operator Red Hat Machine Deletion Remediation Operator redhat-user-workloads/rhwa-tenant/machine-deletion-remediation/mdr-operator-0-7 Red Hat Multiarch Tuning Operator multiarch-tuning/multiarch-tuning-rhel9-operator, multiarch-tuning/multiarch-tuning-operator-bundle Red Hat Multicluster Engine for Kubernetes multicluster-engine/discovery-rhel9, multicluster-engine/assisted-installer-rhel8, multicluster-engine/assisted-installer-rhel9, multicluster-engine/assisted-service-8-rhel8, multicluster-engine/assisted-service-9-rhel9, multicluster-engine/azure-service-operator-rhel9, +8 more Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-rhel8-operator, workload-availability/node-healthcheck-operator-bundle, node-healthcheck-operator-tech-preview/node-healthcheck-operator-rhel8, node-healthcheck-operator-tech-preview/node-healthcheck-rhel8-operator, node-healthcheck-operator-tech-preview/node-healthcheck-operator-bundle, redhat-user-workloads/rhwa-tenant/node-healthcheck-operator/nhc-operator-0-12
    +1 more products
    Red Hat Node Maintenance Operator redhat-user-workloads/rhwa-tenant/node-maintenance-operator/nmo-operator-5-7
    affected: workaround, no fix available
  • Red Hat OpenShift Developer Tools and Services helm
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-rhel9-operator, openshift-lightspeed/openshift-mcp-server-rhel9 Red Hat OpenShift Pipelines openshift-pipelines-client, openshift-pipelines/pipelines-cli-tkn-rhel9, openshift-pipelines/pipelines-chains-controller-rhel9, openshift-pipelines/pipelines-pipelines-as-code-watcher-rhel9, openshift-pipelines/pipelines-pipelines-as-code-webhook-rhel9, openshift-pipelines/pipelines-pipelines-as-code-controller-rhel9 Red Hat OpenShift Serverless kn-workflow-plugin, openshift-serverless-clients, openshift-serverless-1/logic-rhel9-operator, openshift-serverless-1/kn-plugin-func-func-util-rhel9
    affected: workaround, no fix available
  • Red Hat 3scale API Management Platform 2 3scale-amp2/3scale-rhel7-operator
    affected: workaround, no fix planned “Will not fix”
show 7 more
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/submariner-addon-rhel9, rhacm2/multicloud-integrations-rhel9, rhacm2/acm-prometheus-config-reloader-rhel9, rhacm2/multicluster-observability-rhel9-operator, rhacm2/multicluster-operators-subscription-rhel9 Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8, advanced-cluster-security/rhacs-roxctl-rhel8, advanced-cluster-security/rhacs-rhel8-operator, advanced-cluster-security/rhacs-scanner-v4-rhel8
    affected: workaround, no fix available
  • Red Hat Developer Hub 1 rhdh/rhdh-rhel9-operator
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 8 podman, podman-tests, podman-docker, podman-remote, podman-gvproxy, podman-plugins, +6 more Red Hat Enterprise Linux 9 gvisor-tap-vsock, gvisor-tap-vsock-gvforwarder Red Hat Enterprise Linux 10 gvisor-tap-vsock Red Hat OpenShift AI (RHOAI) rhoai/rhai-cli-rhel9, rhoai/odh-trainer-rhel9, rhoai/odh-rhel9-operator, rhoai/odh-codeflare-operator-rhel9, rhoai/odh-modelmesh-serving-controller-rhel9, rhoai/odh-workload-variant-autoscaler-controller-rhel9 Red Hat OpenShift Cluster Manager CLI ocm-cli-clients/ocm-cli-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift Container Platform 4 openshift-clients, openshift3/ose-cli, openshift3/ose-tests, openshift3/ose-console, openshift3/ose-hyperkube, openshift4/ose-sdn-rhel7, +68 more
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 5 openshift5/ose-oauth-apiserver-rhel9, openshift5/ose-aws-cluster-api-controllers-rhel9, openshift5/ose-powervs-machine-controllers-rhel9, openshift5/ose-powervs-cloud-controller-manager-rhel9 Red Hat Openshift Data Foundation 4 ocs4/ocs-rhel8-operator, odf4/mcg-rhel8-operator, odf4/ocs-rhel8-operator, odf4/odf-rhel8-operator, odf4/ocs-metrics-exporter-rhel8 Red Hat OpenShift Dev Spaces devspaces/traefik-rhel9 Red Hat OpenShift Dev Workspaces Operator devworkspace/devworkspace-rhel9-operator, devworkspace/devworkspace-project-clone-rhel9 Red Hat OpenShift distributed tracing 3 rhosdt/tempo-rhel9, rhosdt/tempo-query-rhel9, rhosdt/tempo-jaeger-query-rhel9, rhosdt/opentelemetry-rhel9-operator, rhosdt/opentelemetry-collector-rhel9, rhosdt/opentelemetry-target-allocator-rhel9 Red Hat OpenShift for Windows Containers openshift4-wincw/windows-machine-config-rhel9-operator, openshift4-wincw/windows-machine-config-operator-bundle
    affected: workaround, no fix available
  • Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9, openshift-gitops-1/gitops-rhel8, openshift-gitops-1/gitops-rhel9, openshift-gitops-1/argocd-agent-rhel8, openshift-gitops-1/argo-rollouts-rhel8, +2 more
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat OpenShift on AWS rosa Red Hat OpenShift Virtualization 4 container-native-virtualization/virt-api-rhel9, container-native-virtualization/virt-handler-rhel9, container-native-virtualization/virt-operator-rhel9, container-native-virtualization/virt-cdi-cloner-rhel9, container-native-virtualization/virt-controller-rhel9, container-native-virtualization/virt-exportproxy-rhel9, +9 more Red Hat OpenStack Platform 18.0 rhoso-operators/octavia-rhel9-operator, rhoso-operators/keystone-rhel9-operator, rhoso-operators/designate-rhel9-operator Red Hat Trusted Artifact Signer rhtas/ec-rhel9, rhtas/model-validation-agent-rhel9, rhtas/model-validation-rhel9-operator Red Hat Security Profiles Operator compliance/openshift-selinuxd-rhel8, compliance/openshift-selinuxd-rhel9, compliance/openshift-selinuxd-rhel10 Red Hat Self Node Remediation Operator redhat-user-workloads/rhwa-tenant/self-node-remediation/snr-operator-0-13
    affected: workaround, no fix available

3 more affected, 75 more fixed, 80 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
none
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA 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
go golang.org/x/net
<0.55.0
0.55.0

Affected products

  • golang.org/x/net golang.org/x/net/html

Classification

Weakness
  • CWE-1021 Improper Restriction of Rendered UI Layers or Frames

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.