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Fencer Vulns
high 8.2

CVE-2026-49825 json

lxml: javascript: URL bypass in Cleaner via xlink:href

published 2026-07-08 4 mo ago modified 2026-10-26 14 d ago also EUVD-2026-63390 , GHSA-4jhm-jv67-739f , PYSEC-2026-2614

cvss
8.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.1, link attributes in ``lxml.html.defs.link_attrs`` were missing ``xlink:href``, which can be used for URL bypass attacks in embedded SVG/MathML/etc. content. This vulnerability was fixed in lxml 6.1.1 and lxml_html_clean 0.4.5.

Patch / fix

  • pypi lxml-html-clean 0.4.5
  • lxml lxml 6.1.1
  • fedoralovespython lxml_html_clean 0.4.5
  • lxml Debian 12 4.9.2-1+deb12u1
  • lxml Debian 14 6.1.3-1
  • lxml-html-clean Debian 14 0.4.5-1

debian advisories DEBIAN-CVE-2026-49825

  • lxml Ubuntu 22.04 LTS 4.8.0-1ubuntu0.1
  • lxml Ubuntu 24.04 LTS 5.2.1-1ubuntu0.2
  • lxml Ubuntu 26.04 LTS 6.0.2-1ubuntu0.1
  • lxml Ubuntu Pro 14.04 LTS 3.3.3-1ubuntu0.2+esm6
  • lxml Ubuntu Pro 16.04 LTS 3.5.0-1ubuntu0.4+esm3
  • lxml Ubuntu Pro 18.04 LTS 4.2.1-1ubuntu0.6+esm1
  • lxml Ubuntu Pro 20.04 LTS 4.5.0-1ubuntu0.5+esm1

ubuntu advisories UBUNTU-CVE-2026-49825

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

  • foreman satellite utils 6.17, satellite capsule 6.17, satellite 6.17 3.14.0.22-1.el9sat
  • satellite satellite utils 6.17, satellite capsule 6.17, satellite 6.17 6.17.12-1.el9sat
  • foreman-cli satellite utils 6.17, satellite 6.17 3.14.0.22-1.el9sat
  • foreman-ec2 satellite 6.17 3.14.0.22-1.el9sat
  • foreman-pcp satellite capsule 6.17, satellite 6.17 3.14.0.22-1.el9sat
  • python-lxml satellite capsule 6.17, satellite 6.17 5.3.1-2.el9pc
  • foreman-ovirt satellite 6.17 3.14.0.22-1.el9sat
  • foreman-redis satellite 6.17 3.14.0.22-1.el9sat

red hat advisories RHSA-2026:84593RHSA-2026:84592RHSA-2026:74505RHSA-2026:74506RHSA-2026:74082RHSA-2026:74081

  • grafana Multi Linux Manager Tools SLE-15 12.4.10-150002.4.27.1
  • mgr-push Multi Linux Manager Tools SLE-15 5.2.5-150002.3.12.1
  • spacecmd Multi Linux Manager Tools SLE-15 5.2.10-150002.3.15.1
  • uyuni-tools Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 5.2.17-150002.3.20.1
  • venv-salt-minion Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 3006.0-150002.5.22.1
  • spacewalk-client-tools Multi Linux Manager Tools SLE-15 5.2.7-150002.3.12.1
  • golang-github-prometheus-prometheus Multi Linux Manager Tools SLE-15 3.13.2-150002.3.19.1
  • mgr-push Multi Linux Manager Tools SLE-12 5.2.5-120002.3.12.1

suse advisories SUSE-SU-2026:4585-1SUSE-SU-2026:4584-1SUSE-SU-2026:4583-1SUSE-SU-2026:4582-1SUSE-SU-2026:4581-1SUSE-SU-2026:4580-1

  • python-lxml_html_clean openSUSE Tumbleweed 0.4.5-1.1
  • python-lxml openSUSE Tumbleweed 6.1.1-1.1

opensuse advisories openSUSE-SU-2026:11191-1openSUSE-SU-2026:11147-1

  • python3-lxml AlmaLinux 8 4.2.3-5.el8_10
  • python3.12-lxml AlmaLinux 9 4.9.3-2.el9_8.1
  • python3-lxml AlmaLinux 9 4.6.5-3.el9_8.1

almalinux advisories ALSA-2026:67943ALSA-2026:66203ALSA-2026:66204

  • python-lxml Rocky Linux 8 4.2.3-5.el8_10
  • python3.12-lxml Rocky Linux 9 4.9.3-2.el9_8.1
  • python-lxml Rocky Linux 9 4.6.5-3.el9_8.1

rocky linux advisories RLSA-2026:67943RLSA-2026:66203RLSA-2026:66204

  • python-lxml Azure Linux 3.0 4.9.3-3

azure linux advisories AZL-96857

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-2026-49825 updated cvss 8.2

lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href

  • Red Hat Lightspeed Core lightspeed-core/rag-tool-cpu-rhel9, lightspeed-core/lightspeed-stack-rhel9, lightspeed-core/rag-tool-cuda-12.9-rhel9
    affected: no fix available
  • Red Hat AI Inference Server rhaii/vllm-neuron-rhel9, rhaiis/vllm-neuron-rhel9 Red Hat Ansible Automation Platform 2 ansible-automation-platform-24/controller-rhel8, ansible-automation-platform-25/controller-rhel8, ansible-automation-platform-27/controller-rhel9
    affected: no fix planned “Will not fix”
  • Red Hat Ansible Automation Platform Ansible Core 2 ansible-automation-platform/ee-minimal-rhel8, ansible-automation-platform/ee-minimal-rhel9
    affected: no fix available
  • Red Hat Ceph Storage 7 rhceph/rhceph-7-rhel9 Red Hat Ceph Storage 8 rhceph/rhceph-8-rhel9 Red Hat Ceph Storage 9 rhceph/rhceph-9-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Certification Program for Red Hat Enterprise Linux 9 rhcertification/redhat-certification-cloud-9, rhcertification/redhat-certification-cloud-10, rhcertification/redhat-certification-baremetal, rhcertification/redhat-certification-system-ai-9, rhcertification/redhat-certification-system-ai-10 Red Hat OpenShift AI (RHOAI) rhai/guidellm-rhel9, rhoai/odh-ogx-core-rhel9, rhai-early-access/docling-sdk-cuda-rhel9, rhai-early-access/docling-serve-cuda-rhel9 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9, openshift4/ose-ironic-rhel9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9 Red Hat OpenStack Platform 16.2 rhosp-rhel8/openstack-redis, rhosp-rhel8/openstack-ec2-api, rhosp-rhel8/openstack-haproxy, rhosp-rhel8/openstack-mariadb, rhosp-rhel8/openstack-tempest, rhosp-rhel8/openstack-aodh-api, +83 more Red Hat OpenStack Platform 18.0 rhoso/openstack-aodh-api-rhel9, rhoso/openstack-heat-api-rhel9, rhoso/openstack-nova-api-rhel9, rhoso/openstack-aodh-base-rhel9, rhoso/openstack-heat-base-rhel9, rhoso/openstack-nova-base-rhel9, +43 more
    +1 more products
    Red Hat Satellite 6 python-lxml, python3-lxml
    affected: no fix available
  • Red Hat Update Infrastructure 4 for Cloud Providers python-lxml 5.2.1-4.el10 Red Hat Update Infrastructure 5 rhui5/rhua-tp-rhel9
    affected: no fix planned “Will not fix”
  • Red Hat Ansible Automation Platform 2.5 ansible-automation-platform-25/ee-minimal-rhel8 1789652412, ansible-automation-platform-25/ee-minimal-rhel9 1789720477, ansible-automation-platform-25/ee-supported-rhel8 1789633050, ansible-automation-platform-25/ee-supported-rhel9 1789617630
    fixed: vendor fix RHSA-2026:71210
  • Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-26/hub-rhel9 1789611274, ansible-automation-platform-26/ee-minimal-rhel9 1789654312, ansible-automation-platform-26/ee-supported-rhel9 1789664134
    fixed: vendor fix RHSA-2026:71179
show 21 more
  • Red Hat Ansible Automation Platform 2.7 ansible-automation-platform-27/hub-rhel9 1789572632, ansible-automation-platform-27/ee-minimal-rhel9 1788901236, ansible-automation-platform-27/ee-supported-rhel9 1788924033
    fixed: vendor fix RHSA-2026:67279
  • Red Hat Enterprise Linux AppStream (v. 8) python-lxml 4.2.3-5.el8_10, python3-lxml 4.2.3-5.el8_10
    fixed: vendor fix RHSA-2026:67943
  • Red Hat Enterprise Linux AppStream (v. 9) python-lxml 4.6.5-3.el9_8.1, python3-lxml 4.6.5-3.el9_8.1, python3.12-lxml 4.9.3-2.el9_8.1
    fixed: vendor fix RHSA-2026:66204
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) python-lxml 4.2.3-2.el8_4.1, python3-lxml 4.2.3-2.el8_4.1
    fixed: vendor fix RHSA-2026:90326
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) python-lxml 4.2.3-4.el8_6.1, python3-lxml 4.2.3-4.el8_6.1
    fixed: vendor fix RHSA-2026:84592
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) python-lxml 4.2.3-4.el8_8.1, python3-lxml 4.2.3-4.el8_8.1
    fixed: vendor fix RHSA-2026:84593
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) python-lxml 4.6.5-3.el9_2.1, python3-lxml 4.6.5-3.el9_2.1
    fixed: vendor fix RHSA-2026:67326
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) python-lxml 4.6.5-3.el9_4.1, python3-lxml 4.6.5-3.el9_4.1, python3.12-lxml 4.9.3-2.el9_4.1
    fixed: vendor fix RHSA-2026:67325
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) python-lxml 4.6.5-3.el9_6.1, python3-lxml 4.6.5-3.el9_6.1, python3.12-lxml 4.9.3-2.el9_6.1
    fixed: vendor fix RHSA-2026:67324
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) python-lxml 4.2.3-2.el8_4.1, python3-lxml 4.2.3-2.el8_4.1
    fixed: vendor fix RHSA-2026:90326
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) python-lxml 4.2.3-4.el8_6.1, python3-lxml 4.2.3-4.el8_6.1
    fixed: vendor fix RHSA-2026:84592
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) python-lxml 4.2.3-4.el8_8.1, python3-lxml 4.2.3-4.el8_8.1
    fixed: vendor fix RHSA-2026:84593
  • Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION) python-lxml 2.2.3-1.2.el6_10
    fixed: vendor fix RHSA-2026:90336
  • Red Hat Enterprise Linux Server (v. 7 ELS) python-lxml 3.2.1-4.el7_9.1 Red Hat Enterprise Linux Server Optional (v. 7 ELS) python-lxml-docs 3.2.1-4.el7_9.1
    fixed: vendor fix RHSA-2026:90327
  • Red Hat OpenShift AI 2.25 rhoai/odh-ta-lmes-job-rhel9 1791553527, rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9 1791867208, rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9 1791867189
    fixed: vendor fix RHSA-2026:87410
  • Red Hat OpenShift AI 3.4 rhoai/odh-autorag-rhel9 1791557539, rhoai/odh-ta-lmes-job-rhel9 1791470318, rhoai/odh-feature-server-rhel9 1791863220, rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9 1791829658, rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9 1791832538
    fixed: vendor fix RHSA-2026:84734
  • Red Hat OpenShift AI 3.5 rhoai/odh-ta-lmes-job-rhel9 1792501995, rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9 1791816487, rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9 1791817844
    fixed: vendor fix RHSA-2026:86891
  • Red Hat Quay 3.9 quay/quay-rhel8 1790808443
    fixed: vendor fix RHSA-2026:77656
  • Red Hat Quay 3.10 quay/quay-rhel8 1791462428
    fixed: vendor fix RHSA-2026:79366
  • Red Hat Quay 3.12 quay/quay-rhel8 1791314514
    fixed: vendor fix RHSA-2026:79546
  • Red Hat Quay 3.17 quay/quay-rhel9 1790690298
    fixed: vendor fix RHSA-2026:74511

5 more fixed, 23 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
2 mo ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-4jhm-jv67-739f referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
GitHub 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
OSV 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Affected packages

ecosystem package affected fixed in
pypi lxml-html-clean
<0.4.5
0.4.5

Affected products

  • lxml lxml
  • fedora-python lxml_html_clean

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation
  • CWE-184 Incomplete List of Disallowed Inputs

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.