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Fencer Vulns
medium 5.3

CVE-2025-47911 json

Quadratic parsing complexity in golang.org/x/net/html

published 2026-02-05 9 mo ago modified 2026-09-10 1 mo ago also EUVD-2025-206856 , GHSA-w4gw-w5jq-g9jh , GO-2026-4440

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 46%
public exploits
0
none known

Summary

The html.Parse function in golang.org/x/net/html has quadratic parsing complexity when processing certain inputs, which can lead to denial of service (DoS) if an attacker provides specially crafted HTML content.

Patch / fix

  • go golang.org/x/net/html 0.45.0
  • go golang.org/x/net 0.45.0
  • golang.org/x/net golang.org/x/net/html 0.45.0
  • golang-golang-x-net Debian 14 1:0.47.0-1

debian advisories DEBIAN-CVE-2025-47911

  • golang-golang-x-net Ubuntu 22.04 LTS 1:0.0+git20211209.491a49a+dfsg-1ubuntu0.1
  • lxd Ubuntu Pro 16.04 LTS 2.0.11-0ubuntu1~16.04.4+esm2
  • lxd Ubuntu Pro 18.04 LTS 3.0.3-0ubuntu1~18.04.2+esm2
  • juju-core Ubuntu Pro 16.04 LTS 2.3.7-0ubuntu0.16.04.1+esm2
  • golang-golang-x-net Ubuntu Pro 22.04 LTS 1:0.0+git20211209.491a49a+dfsg-1ubuntu0.1~esm2
  • golang-golang-x-net Ubuntu Pro 24.04 LTS 1:0.21.0+dfsg-1ubuntu0.1~esm2
  • golang-golang-x-net-dev Ubuntu Pro 16.04 LTS 1:0.0+git20160110.4fd4a9f-1ubuntu0.1~esm2
  • golang-golang-x-net-dev Ubuntu Pro 18.04 LTS 1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm2

ubuntu advisories UBUNTU-CVE-2025-47911

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • golang1.25 hummingbird 1 1.25.9-1.hum1
  • golang1.25-bin hummingbird 1 1.25.9-1.hum1
  • golang1.25-src hummingbird 1 1.25.9-1.hum1
  • golang1.25-misc hummingbird 1 1.25.9-1.hum1
  • golang1.25-tests hummingbird 1 1.25.9-1.hum1
  • golang1.25-shared hummingbird 1 1.25.9-1.hum1
  • golang1.26 hummingbird 1 1.26.2-1.hum1
  • golang1.26-bin hummingbird 1 1.26.2-1.hum1

red hat advisories RHSA-2026:7385RHSA-2026:7291

  • kubevirt-1.6 SLE Module for Containers 15 SP7 1.6.6-150700.15.17.1
  • 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
  • terraform-provider-local SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 2.0.0-150200.6.17.1
  • terraform-provider-google SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 3.43.0-150200.6.12.1
  • terraform-provider-random SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 3.0.0-150200.6.15.1

suse advisories SUSE-SU-2026:3630-1SUSE-SU-2026:3056-1SUSE-SU-2026:22558-1SUSE-SU-2026:2493-1SUSE-SU-2026:22242-1SUSE-SU-2026:22249-1

  • kubeseal openSUSE Tumbleweed 0.41.1-1.1
  • kumactl openSUSE Tumbleweed 3.0.0-1.1
  • timoni openSUSE Tumbleweed 0.36.0-1.1
  • kured openSUSE Tumbleweed 1.23.0-1.1
  • pocketbase openSUSE Tumbleweed 0.40.5-1.1
  • 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
  • gitea-tea openSUSE Leap 16.0 0.15.1-bp160.1.1

opensuse advisories openSUSE-SU-2026:12299-1openSUSE-SU-2026:12300-1openSUSE-SU-2026:12309-1openSUSE-SU-2026:12271-1openSUSE-SU-2026:12167-1openSUSE-SU-2026:21824-1

  • application-gateway-kubernetes-ingress CBL-Mariner 2.0 1.4.0-27
  • cert-manager CBL-Mariner 2.0 1.11.2-27
  • cf-cli CBL-Mariner 2.0 8.4.0-27
  • cni CBL-Mariner 2.0 1.0.1-21
  • cni-plugins CBL-Mariner 2.0 1.3.0-11
  • containerized-data-importer CBL-Mariner 2.0 1.55.0-28
  • cri-o CBL-Mariner 2.0 1.22.3-20
  • cri-tools CBL-Mariner 2.0 1.29.0-9

azure linux advisories AZL-76818AZL-76824AZL-76830AZL-76833AZL-76836AZL-76842

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-2025-47911 updated cvss 5.3

golang.org/x/net/html: Quadratic parsing complexity in golang.org/x/net/html

  • 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 Red Hat Builds for Red Hat OpenShift openshift-builds/openshift-builds-waiters-rhel9, openshift-builds/openshift-builds-webhook-rhel9, openshift-builds/openshift-builds-rhel9-operator, openshift-builds/openshift-builds-controller-rhel9, openshift-builds/openshift-builds-git-cloner-rhel9, openshift-builds/openshift-builds-image-bundler-rhel9, +3 more Red Hat Compliance Operator compliance/openshift-compliance-operator-bundle 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 Red Hat Cryostat 4 cryostat/cryostat-storage-rhel9, cryostat/cryostat-rhel9-operator, cryostat/cryostat-ose-oauth-proxy-rhel9, cryostat/cryostat-grafana-dashboard-rhel9 Red Hat Custom Metric Autoscaler operator for Red Hat Openshift custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9, custom-metrics-autoscaler/custom-metrics-autoscaler-adapter-rhel9, custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9-operator, custom-metrics-autoscaler/custom-metrics-autoscaler-admission-webhooks-rhel9
    +34 more products
    Red Hat Deployment Validation Operator dvo/deployment-validation-rhel8-operator Red Hat External Secrets Operator for Red Hat OpenShift external-secrets-operator/external-secrets-rhel9 Red Hat Fence Agents Remediation Operator workload-availability/fence-agents-remediation-rhel8-operator, workload-availability/fence-agents-remediation-operator-bundle Red Hat File Integrity Operator compliance/openshift-compliance-operator-bundle Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9-operator Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/logging-loki-rhel9, openshift-logging/lokistack-gateway-rhel9, openshift-logging/elasticsearch-proxy-rhel9, openshift-logging/elasticsearch-rhel9-operator, openshift-logging/cluster-logging-rhel9-operator Red Hat Migration Toolkit for Applications 8 mta/mta-cli-rhel9, mta/mta-hub-rhel9, mta/mta-analyzer-addon-rhel9, mta/mta-platform-addon-rhel9, mta/mta-discovery-addon-rhel9, mta/mta-solution-server-rhel9, +4 more Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-controller-rhel8 Red Hat Multiarch Tuning Operator multiarch-tuning/multiarch-tuning-rhel9-operator 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/image-based-install-rhel9, +9 more Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-agent-rhel9, multicluster-globalhub/multicluster-globalhub-grafana-rhel9, multicluster-globalhub/multicluster-globalhub-manager-rhel9, multicluster-globalhub/multicluster-globalhub-rhel9-operator, multicluster-globalhub/multicluster-globalhub-operator-bundle Red Hat Network Observability Operator network-observability/network-observability-cli-rhel9, network-observability/network-observability-rhel9-operator, network-observability/network-observability-ebpf-agent-rhel9, network-observability/network-observability-flowlogs-pipeline-rhel9 Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-rhel8-operator, workload-availability/node-healthcheck-operator-bundle Red Hat OpenShift API for Data Protection oadp/oadp-rhel9-operator, oadp/oadp-mustgather-rhel9, oadp/oadp-kubevirt-velero-plugin-rhel9, oadp/oadp-velero-restic-restore-helper-rhel9 Red Hat OpenShift Developer Tools and Services helm Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-rhel9-operator, openshift-lightspeed/lightspeed-operator-bundle, openshift-lightspeed/openshift-mcp-server-rhel9 Red Hat OpenShift Pipelines openshift-pipelines-client Red Hat OpenShift Serverless kn-workflow-plugin, openshift-serverless-clients, openshift-serverless-1/kn-plugin-func-func-util-rhel9 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/kiali-rhel9, openshift-service-mesh/istio-cni-rhel9, openshift-service-mesh/istio-pilot-rhel9, openshift-service-mesh/istio-proxyv2-rhel9, openshift-service-mesh/istio-rhel9-operator Red Hat 3scale API Management Platform 2 3scale-amp26/operator, 3scale-amp26/3scale-operator, 3scale-amp2/3scale-rhel7-operator, 3scale-amp2/3scale-rhel9-operator, 3scale-amp2/3scale-operator-bundle Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/subctl-rhel9, rhacm2/nettest-rhel9, rhacm2/volsync-rhel9, rhacm2/acm-grafana-rhel9, rhacm2/acm-prometheus-rhel9, rhacm2/acm-siteconfig-rhel9, +24 more Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8, advanced-cluster-security/rhacs-roxctl-rhel8, advanced-cluster-security/rhacs-scanner-rhel8, advanced-cluster-security/rhacs-rhel8-operator, advanced-cluster-security/rhacs-scanner-v4-rhel8, advanced-cluster-security/rhacs-scanner-slim-rhel8 Red Hat Ansible Automation Platform 2 receptor, ansible-automation-platform-26/receptor-rhel9 Red Hat Ceph Storage 5 rhel8/grafana, rhel9/grafana, rhceph/grafana-rhel9 Red Hat Ceph Storage 6 rhel8/grafana, rhel9/grafana, rhceph/grafana-rhel9 Red Hat Developer Hub 1 rhdh/rhdh-rhel9-operator Red Hat Edge Manager 1 flightctl, rhem/flightctl-api-rhel9, rhem/flightctl-worker-rhel9, rhem/flightctl-db-setup-rhel9, rhem/flightctl-periodic-rhel9, rhem/flightctl-pam-issuer-rhel9, +5 more Red Hat Enterprise Linux 8 podman, podman-tests, podman-docker, podman-remote, podman-gvproxy, podman-plugins, +6 more Red Hat Enterprise Linux 9 podman, grafana, podman-tests, image-builder, podman-docker, podman-remote, +11 more Red Hat Enterprise Linux 10 podman, grafana, image-builder, gvisor-tap-vsock, osbuild-composer, opentelemetry-collector Red Hat Lightspeed for Runtimes Operator rh-lightspeed-runtimes/runtimes-inventory-rhel9-operator Red Hat OpenShift AI (RHOAI) rhoai/rhai-cli-rhel9, rhoai/odh-trainer-rhel9, rhoai/odh-rhel9-operator, rhoai/odh-feast-operator-rhel9, rhoai/odh-kueue-controller-rhel9, rhoai/odh-model-controller-rhel9, +11 more Red Hat OpenShift Cluster Manager CLI ocm-cli-clients/ocm-cli-rhel9 Red Hat OpenShift Container Platform 4 cri-o, podman, cri-tools, openshift, microshift, podman-tests, +224 more
    affected: no fix available “Fix deferred”

15 more affected, 6 more fixed, 4 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
yes
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
go golang.org/x/net/html
<0.45.0
0.45.0
go golang.org/x/net
<0.45.0
0.45.0

Affected products

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

Classification

Weakness
  • CWE-407 Inefficient Algorithmic Complexity

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.