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TI-2026-30785 Aliases CVE-2026-42502GHSA-wrh2-89vg-4j9g

Invoking incorrect handling of HTML elements in foreign content in golang.org/x/net/html

Priority LOW 27CWE-1021Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · None
Fix status
Partial Red Hat: 50 fixed, 56 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-1021.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00223 13th percentileScored 2026-11-07
Fix Partial golang.org/x/net/html (golang.org/x/net): 0.55.0Red Hat: 71 advisoriesRed Hat: 50 fixed, 56 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Go standard librarygolang.org/x/net/htmlbefore 0.55.00.55.0Patch availableCNA
  • golang.org/x/net/html VendorGo standard library Affected before 0.55.0 Fixed in 0.55.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:golang:net:*:*:*:*:*:go:*:*before 0.55.0VulnerableGo standard library

Remediation

  • Fix · CNA golang.org/x/net/html (golang.org/x/net) Fixed in 0.55.0

Red Hat 71 advisories

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    Red Hat Advanced Cluster Management for Kubernetes v2.14.6 security update
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    Multicluster Global Hub 1.5.8 security update
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    OpenShift Container Platform 4.20.39 bug fix and security update
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    Multicluster Global Hub 1.8.2 security update
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    • Red Hat Enterprise Linux AppStream EUS (v.9.6) grafana-10.2.6-22.el9_6, grafana-selinux-10.2.6-22.el9_6
  • RHSA-2026:43692 Released 2026-07-22 · Red Hat rating Important
    Red Hat OpenShift API for Data Protection
    • OpenShift API for Data Protection 1.6 registry.redhat.io/oadp/oadp-velero-rhel9
  • RHSA-2026:37387 Released 2026-07-09 · Red Hat rating Important
    Red Hat OpenShift Data Foundation 4.22.0 security, enhancement & bug fix update
    • Red Hat Openshift Data Foundation 4.22 registry.redhat.io/odf4/cephcsi-rhel9, registry.redhat.io/odf4/cephcsi-rhel9-operator, registry.redhat.io/odf4/devicefinder-rhel9 +24
  • RHSA-2026:36625 Released 2026-07-08 · Red Hat rating Important
    RHACS 4.10.5 security and bug fix update
    • Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10 registry.redhat.io/advanced-cluster-security/rhacs-main-rhel8, registry.redhat.io/advanced-cluster-security/rhacs-rhel8-operator, registry.redhat.io/advanced-cluster-security/rhacs-roxctl-rhel8 +3
  • RHSA-2026:36319 Released 2026-07-07 · Red Hat rating Important
    RHACS 4.9.9 security and bug fix update
    • Red Hat Advanced Cluster Security 4.9 registry.redhat.io/advanced-cluster-security/rhacs-main-rhel8, registry.redhat.io/advanced-cluster-security/rhacs-rhel8-operator, registry.redhat.io/advanced-cluster-security/rhacs-roxctl-rhel8 +3
  • RHSA-2026:36207 Released 2026-07-07 · Red Hat rating Important
    RHACS 4.11.1 security and bug fix update
    • Red Hat Advanced Cluster Security for Kubernetes 4.11 registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9, registry.redhat.io/advanced-cluster-security/rhacs-operator-bundle, registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator +4
  • RHSA-2026:26547 Released 2026-06-17 · Red Hat rating Important
    RHACS 4.10.4 security and bug fix update
    • Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10 registry.redhat.io/advanced-cluster-security/rhacs-main-rhel8, registry.redhat.io/advanced-cluster-security/rhacs-rhel8-operator, registry.redhat.io/advanced-cluster-security/rhacs-roxctl-rhel8 +1
  • RHSA-2026:26546 Released 2026-06-17 · Red Hat rating Important
    RHACS 4.9.8 security and bug fix update
    • Red Hat Advanced Cluster Security 4.9 registry.redhat.io/advanced-cluster-security/rhacs-main-rhel8, registry.redhat.io/advanced-cluster-security/rhacs-rhel8-operator, registry.redhat.io/advanced-cluster-security/rhacs-roxctl-rhel8 +1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    golang.org/x/net/html 0.55.0

    5 records Highest priority Priority LOW 5 LOW

    Other records, highest priority first

    • TI-2026-20765 Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/htmlPriority LOW 29
    • TI-2026-30789 Invoking incorrect handling of namespaced elements in foreign content in golang.org/x/net/htmlPriority LOW 27
    • TI-2026-21586 Invoking duplicate attributes can cause XSS in golang.org/x/net/htmlPriority LOW 27
    Show all 5 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Assisted Installer for Red Hat OpenShift Container Platform 2AffectedNo fix yet
Builds for Red Hat OpenShiftAffectedNo fix yet: Fix deferred
Compliance OperatorAffectedNo fix yet: Fix deferred
Confidential Compute AttestationAffectedNo fix yet: Fix deferred
Cryostat 4AffectedNo fix yet: Fix deferred
External Secrets Operator for Red Hat OpenShiftAffectedNo fix yet: Fix deferred
Fence Agents Remediation OperatorAffectedNo fix yet
File Integrity OperatorAffectedNo fix yet: Fix deferred
Gatekeeper 3AffectedNo fix yet: Fix deferred
Logical Volume Manager StorageAffectedNo fix yet
Migration Toolkit for Applications 8AffectedNo fix yet
Migration Toolkit for ContainersAffectedNo fix yet: Fix deferred
Multiarch Tuning OperatorAffectedNo fix yet: Fix deferred
Multicluster Engine for KubernetesAffectedNo fix yet
Network Observability OperatorAffectedNo fix yet: Fix deferred
Node HealthCheck OperatorAffectedNo fix yet
OpenShift Developer Tools and ServicesAffectedNo fix yet: Fix deferred
OpenShift LightspeedAffectedNo fix yet: Fix deferred
OpenShift PipelinesAffectedNo fix yet: Fix deferred
OpenShift ServerlessAffectedNo fix yet
OpenShift Service Mesh 3AffectedNo fix yet: Fix deferred
Red Hat 3scale API Management Platform 2AffectedNo fix yet: Fix deferred
Red Hat Advanced Cluster Management for Kubernetes 2AffectedNo fix yet: Fix deferred
Red Hat Ansible Automation Platform 2AffectedNo fix yet: Fix deferred
Red Hat Ceph Storage 5AffectedNo fix yet: Fix deferred
Red Hat Ceph Storage 7AffectedNo fix yet: Fix deferred
Red Hat Ceph Storage 8AffectedNo fix yet: Fix deferred
Red Hat Ceph Storage 9AffectedNo fix yet: Fix deferred
Red Hat Connectivity Link 1AffectedNo fix yet: Fix deferred
Red Hat Developer Hub 1AffectedNo fix yet: Fix deferred
Red Hat Edge Manager 1AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Hardened ImagesAffectedNo fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet
Red Hat OpenShift Cluster Manager CLIAffectedNo fix yet
Red Hat OpenShift Container Platform 4AffectedNo fix yet
Red Hat OpenShift Container Platform 5AffectedNo fix yet
Red Hat OpenShift Dev SpacesAffectedNo fix yet: Fix deferred
Red Hat OpenShift Dev Workspaces OperatorAffectedNo fix yet
Red Hat OpenShift GitOpsAffectedNo fix yet: Fix deferred
Red Hat OpenShift Virtualization 4AffectedNo fix yet: Fix deferred
Red Hat OpenShift distributed tracing 3AffectedNo fix yet: Fix deferred
Red Hat OpenShift for Windows ContainersAffectedNo fix yet: Fix deferred
Red Hat OpenShift on AWSAffectedNo fix yet
Red Hat OpenStack Platform 16.2AffectedNo fix yet: Fix deferred
Red Hat OpenStack Platform 17.1AffectedNo fix yet: Fix deferred
Red Hat OpenStack Platform 18.0AffectedNo fix yet
Red Hat Quay 3AffectedNo fix yet: Fix deferred
Red Hat Service Interconnect 2AffectedNo fix planned: Will not fix
Red Hat Trusted Artifact SignerAffectedNo fix yet: Fix deferred
Security Profiles OperatorAffectedNo fix yet
Zero Trust Workload Identity ManagerAffectedNo fix yet: Fix deferred
Zero Trust Workload Identity Manager - Tech PreviewAffectedNo fix yet: Fix deferred
cert-manager Operator for Red Hat OpenShiftAffectedNo fix yet: Fix deferred
Cert Manager support for Red Hat OpenShift release 1.17Fixed RHSA-2026:82304, RHSA-2026:82322
Cert Manager support for Red Hat OpenShift release 1.19Fixed RHSA-2026:54527, RHSA-2026:54531
Logging Subsystem for Red Hat OpenShift 6.0Fixed RHSA-2026:83013
Logging Subsystem for Red Hat OpenShift 6.2Fixed RHSA-2026:68349
Logging Subsystem for Red Hat OpenShift 6.4Fixed RHSA-2026:77639
Logging Subsystem for Red Hat OpenShift 6.5Fixed RHSA-2026:56340, RHSA-2026:70870
Multicluster Global Hub 1.4.9Fixed RHSA-2026:67516
Multicluster Global Hub 1.5.8Fixed RHSA-2026:71597
Multicluster Global Hub 1.6.6Fixed RHSA-2026:73419
Multicluster Global Hub 1.8.2Fixed RHSA-2026:68515, RHSA-2026:73038
OpenShift API for Data Protection 1.4Fixed RHSA-2026:59467
OpenShift API for Data Protection 1.5Fixed RHSA-2026:66022
OpenShift API for Data Protection 1.6Fixed RHSA-2026:43692
OpenShift File Integrity Operator - FIO 1Fixed RHSA-2026:54288
Red Hat Advanced Cluster Management for Kubernetes 2.11Fixed RHSA-2026:60387, RHSA-2026:67538
Red Hat Advanced Cluster Management for Kubernetes 2.13Fixed RHSA-2026:60390
Red Hat Advanced Cluster Management for Kubernetes 2.14Fixed RHSA-2026:60388, RHSA-2026:72881
Red Hat Advanced Cluster Management for Kubernetes 2.15Fixed RHSA-2026:54427, RHSA-2026:67541
Red Hat Advanced Cluster Management for Kubernetes 2.16Fixed RHSA-2026:57191, RHSA-2026:60391, RHSA-2026:72892
Red Hat Advanced Cluster Management for Kubernetes 2.17Fixed RHSA-2026:60386, RHSA-2026:63016
Red Hat Advanced Cluster Security 4.9Fixed RHSA-2026:26546, RHSA-2026:36319
Red Hat Advanced Cluster Security for Kubernetes 4.11Fixed RHSA-2026:36207
Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10Fixed RHSA-2026:26547, RHSA-2026:36625
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:66432, RHSA-2026:67139
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:67138, RHSA-2026:69293
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:90493
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:90363
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:61585
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:59562
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:63134, RHSA-2026:67517
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:51112, RHSA-2026:59560
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)Fixed RHSA-2026:90493
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:90363
Red Hat Hardened ImagesFixed RHSA-2026:62391, RHSA-2026:66561
Red Hat Lightspeed (formerly Insights) for Runtimes 1.0Fixed RHSA-2026:54441
Red Hat OpenShift AI 2.25Fixed RHSA-2026:65126, RHSA-2026:87410
Red Hat OpenShift AI 3.3Fixed RHSA-2026:73987
Red Hat OpenShift AI 3.4Fixed RHSA-2026:60520, RHSA-2026:84734, RHSA-2026:91248, RHSA-2026:92510
Red Hat OpenShift AI 3.5Fixed RHSA-2026:91249
Red Hat OpenShift Container Platform 4.20Fixed RHSA-2026:68541
Red Hat OpenShift Container Platform 4.21Fixed RHSA-2026:66352, RHSA-2026:83702
Red Hat OpenShift Container Platform 4.22Fixed RHSA-2026:66358, RHSA-2026:89198
Red Hat OpenShift Dev Spaces 3.31Fixed RHSA-2026:90321
Red Hat OpenShift distributed tracing 3.11Fixed RHSA-2026:65343
Red Hat Openshift Data Foundation 4.22Fixed RHSA-2026:37387
Red Hat Satellite 6.18Fixed RHSA-2026:51341
multicluster engine for Kubernetes 2.11Fixed RHSA-2026:57194
multicluster engine for Kubernetes 2.6Fixed RHSA-2026:59579
multicluster engine for Kubernetes 2.8Fixed RHSA-2026:59558
multicluster engine for Kubernetes 2.9Fixed RHSA-2026:59559
Not affected: 43 products
  • Logging Subsystem for Red Hat OpenShift 6.0
  • Logging Subsystem for Red Hat OpenShift 6.2
  • Logging Subsystem for Red Hat OpenShift 6.4
  • Logging Subsystem for Red Hat OpenShift 6.5
  • Logical Volume Manager Storage
  • Migration Toolkit for Applications 8
  • Multicluster Global Hub 1.4.9
  • Multicluster Global Hub 1.5.8
  • Multicluster Global Hub 1.6.6
  • Multicluster Global Hub 1.8.2
  • OpenShift API for Data Protection 1.4
  • OpenShift API for Data Protection 1.5
  • OpenShift API for Data Protection 1.6
  • OpenShift File Integrity Operator - FIO 1
  • Red Hat Advanced Cluster Management for Kubernetes 2.11
  • Red Hat Advanced Cluster Management for Kubernetes 2.13
  • Red Hat Advanced Cluster Management for Kubernetes 2.14
  • Red Hat Advanced Cluster Management for Kubernetes 2.15
  • Red Hat Advanced Cluster Management for Kubernetes 2.16
  • Red Hat Advanced Cluster Management for Kubernetes 2.17
  • Red Hat Advanced Cluster Security 4.9
  • Red Hat Advanced Cluster Security for Kubernetes 4.11
  • Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10
  • Red Hat Lightspeed (formerly Insights) for Runtimes 1.0
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat OpenShift AI 2.25
  • Red Hat OpenShift AI 3.3
  • Red Hat OpenShift AI 3.4
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Container Platform 4.20
  • Red Hat OpenShift Container Platform 4.21
  • Red Hat OpenShift Container Platform 4.22
  • Red Hat OpenShift Container Platform 5
  • Red Hat OpenShift Dev Spaces 3.31
  • Red Hat OpenShift distributed tracing 3.11
  • Red Hat OpenStack Platform 16.2
  • Red Hat OpenStack Platform 17.1
  • Red Hat OpenStack Platform 18.0
  • Red Hat Openshift Data Foundation 4.22
  • multicluster engine for Kubernetes 2.11
  • multicluster engine for Kubernetes 2.6
  • multicluster engine for Kubernetes 2.8
  • multicluster engine for Kubernetes 2.9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42502
  2. 2026-10-03 Alias added: GHSA-wrh2-89vg-4j9g
  3. 2026-10-07 Fix available: RHSA-2026:73987 · Red Hat
  4. 2026-10-08 Fix available: RHSA-2026:77639 · Red Hat
  5. 2026-10-08 Fix available: Logging Subsystem for Red Hat OpenShift 6.4 · Red Hat
  6. 2026-10-09 Fix available: Red Hat OpenShift distributed tracing 3.11.2 · Red Hat
  7. 2026-10-10 Affected versions changed · Red Hat
  8. 2026-10-13 Fix available: Red Hat OpenShift distributed tracing 3.11 · Red Hat
  9. 2026-10-14 Fix available: RHSA-2026:82304 · Red Hat
  10. 2026-10-14 Fix available: RHSA-2026:82322 · Red Hat
  11. 2026-10-15 Fix available: RHSA-2026:83013 · Red Hat
  12. 2026-10-16 Fix available: Cert Manager support for Red Hat OpenShift release 1.17, Logging Subsystem for Red Hat OpenShift 6.0 · Red Hat
  13. 2026-10-18 Affected versions changed · Red Hat
  14. 2026-10-20 Fix available: RHSA-2026:84734 · Red Hat
  15. 2026-10-20 Fix available: RHSA-2026:83702 · Red Hat
  16. 2026-10-20 Affected versions changed · Red Hat
  17. 2026-10-21 Affected versions changed · Red Hat
  18. 2026-10-22 Fix available: RHSA-2026:87410 · Red Hat
  19. 2026-10-23 Fix available: Red Hat Advanced Cluster Security for Kubernetes for IBM Z and LinuxONE 4.11, Red Hat OpenShift distributed tracing 3.11.3 · Red Hat
  20. 2026-10-26 Fix available: Red Hat OpenShift distributed tracing 3.11 · Red Hat
  21. 2026-10-27 Fix available: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) +1 · Red Hat
  22. 2026-10-29 Fix available: RHSA-2026:90493 · Red Hat
  23. 2026-10-29 Fix available: RHSA-2026:90363 · Red Hat
  24. 2026-10-30 Fix available: RHSA-2026:91248 · Red Hat
  25. 2026-10-30 Fix available: RHSA-2026:91249 · Red Hat
  26. 2026-10-30 Fix available: RHSA-2026:89198 · Red Hat
  27. 2026-10-30 Fix available: RHSA-2026:90321 · Red Hat
  28. 2026-10-30 Fix available: RHSA-2026:92510 · Red Hat
  29. 2026-10-30 Fix available: Red Hat OpenShift AI 3.5, Red Hat OpenShift Dev Spaces 3.31 · Red Hat
  30. 2026-10-30 Affected versions changed · Red Hat
  31. 2026-10-31 Fix available: Red Hat Advanced Cluster Security for Kubernetes 4.11 · Red Hat
  32. 2026-11-06 Fix available: Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10 · Red Hat

References

Advisory 1

Other 3

  • TI-2026-28703 Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna CVSS 3.1CRITICAL 9.6
  • TI-2018-12685 The html package (aka x/net/html) through 2018-09-25 in Go mishandles… CVSS 3.1HIGH 7.5
  • TI-2018-12250 The html package (aka x/net/html) through 2018-09-17 in Go mishandles… CVSS 3.1HIGH 7.5
  • TI-2018-12206 The html package (aka x/net/html) before 2018-07-13 in Go mishandles "in frameset"… CVSS 3.1HIGH 7.5
  • TI-2018-12687 The html package (aka x/net/html) through 2018-09-25 in Go mishandles… CVSS 3.1HIGH 7.5
  • TI-2018-12686 The html package (aka x/net/html) through 2018-09-25 in Go mishandles… CVSS 3.1HIGH 7.5
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences