Description
An issue was discovered in lxml before 4.2.5. lxml/html/clean.py in the lxml.html.clean module does not remove javascript: URLs that use escaping, allowing a remote attacker to conduct XSS attacks, as demonstrated by "j a v a s c r i p t:" in Internet Explorer. This is a similar issue to CVE-2014-3146.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | lxml | 4.2.5-1 | — |
| Debian 13 | lxml | 4.2.5-1 | — |
| Debian 12 | lxml | 4.2.5-1 | — |
| Debian 9 | lxml | 3.7.1-1+deb9u1 | DLA-2467-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | lxml | 4.2.1-1ubuntu0.1 | USN-3841-1 |
| Ubuntu 16.04 LTS | lxml | 3.5.0-1ubuntu0.1 | USN-3841-1 |
| Ubuntu 14.04 LTS | lxml | 3.3.3-1ubuntu0.2 | USN-3841-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | python-lxml | 4.7.1-3.7.1 | SUSE-SU-2022:0803-1 |
| SLES 15 SP2 | python-lxml | 4.7.1-3.7.1 | SUSE-SU-2022:0803-1 |
| SLES 12 SP5 | python-lxml | 3.6.1-8.5.1 | SUSE-SU-2022:0895-1 |
| SLES 2 | python-lxml | 4.7.1-3.7.1 | SUSE-SU-2022:0803-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP2 | python-lxml | 4.7.1-3.7.1 | SUSE-SU-2022:0803-1 |
| SLES for SAP 12 SP5 | python-lxml | 3.6.1-8.5.1 | SUSE-SU-2022:0895-1 |
| SLE Real Time 15 SP2 | python-lxml | 4.7.1-3.7.1 | SUSE-SU-2022:0803-1 |
| SLE HPC 15 SP2 | python-lxml | 4.7.1-3.7.1 | SUSE-SU-2022:0803-1 |
| SUSE OpenStack Cloud Crowbar 9 | grafana | 6.7.4-3.26.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 9 | openstack-barbican | 7.0.1~dev24-3.14.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 9 | openstack-cinder | 13.0.10~dev24-3.34.2 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 9 | openstack-heat-gbp | 14.0.1~dev4-3.9.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 9 | openstack-horizon-plugin-gbp-ui | 14.0.1~dev3-3.9.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 9 | openstack-ironic | 11.1.5~dev18-3.28.2 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 9 | openstack-keystone | 14.2.1~dev9-3.28.2 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 9 | openstack-neutron | 13.0.8~dev206-3.40.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 9 | openstack-neutron-gbp | 14.0.1~dev33-3.31.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 9 | python-Pillow | 5.2.0-3.17.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 9 | python-XStatic-jquery-ui | 1.13.0.1-4.3.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 9 | python-lxml | 4.2.4-3.3.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 9 | release-notes-suse-openstack-cloud | 9.20220413-3.30.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 9 | rubygem-sinatra | 1.4.6-4.3.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud Crowbar 8 | python-lxml | 3.6.1-8.5.1 | SUSE-SU-2022:0895-1 |
| SUSE OpenStack Cloud 9 | ardana-barbican | 9.0+git.1644879908.8a641c1-3.13.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | grafana | 6.7.4-3.26.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | openstack-barbican | 7.0.1~dev24-3.14.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | openstack-cinder | 13.0.10~dev24-3.34.2 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | openstack-heat-gbp | 14.0.1~dev4-3.9.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | openstack-horizon-plugin-gbp-ui | 14.0.1~dev3-3.9.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | openstack-ironic | 11.1.5~dev18-3.28.2 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | openstack-keystone | 14.2.1~dev9-3.28.2 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | openstack-neutron | 13.0.8~dev206-3.40.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | openstack-neutron-gbp | 14.0.1~dev33-3.31.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | python-Pillow | 5.2.0-3.17.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | python-XStatic-jquery-ui | 1.13.0.1-4.3.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | python-lxml | 4.2.4-3.3.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | release-notes-suse-openstack-cloud | 9.20220413-3.30.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-barbican | 7.0.1~dev24-3.35.2 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-cinder | 13.0.10~dev24-3.38.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-designate | 7.0.2~dev2-3.35.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-glance | 17.0.1~dev30-3.33.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-heat | 11.0.4~dev4-3.35.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-horizon | 14.1.1~dev11-4.39.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-ironic | 11.1.5~dev18-4.33.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-keystone | 14.2.1~dev9-3.36.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-magnum | 7.2.1~dev1-4.35.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-manila | 7.4.2~dev60-3.41.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-monasca | 2.7.1~dev10-3.37.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-monasca-ceilometer | 1.8.2~dev3-3.35.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-neutron | 13.0.8~dev206-6.39.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-nova | 18.3.1~dev91-3.39.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-octavia | 3.2.3~dev7-4.35.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-sahara | 9.0.2~dev15-3.35.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 9 | venv-openstack-swift | 2.19.2~dev48-2.30.1 | SUSE-SU-2022:1729-1 |
| SUSE OpenStack Cloud 8 | python-lxml | 3.6.1-8.5.1 | SUSE-SU-2022:0895-1 |
| SUSE Manager Server 4.1 | python-lxml | 4.7.1-3.7.1 | SUSE-SU-2022:0803-1 |
| SUSE Manager Retail Branch Server 4.1 | python-lxml | 4.7.1-3.7.1 | SUSE-SU-2022:0803-1 |
| SUSE Manager Proxy 4.1 | python-lxml | 4.7.1-3.7.1 | SUSE-SU-2022:0803-1 |
| SUSE HPE Helion OpenStack 8 | python-lxml | 3.6.1-8.5.1 | SUSE-SU-2022:0895-1 |
| SUSE Enterprise Storage 7 | python-lxml | 4.7.1-3.7.1 | SUSE-SU-2022:0803-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | python-lxml | 4.7.1-3.7.1 | openSUSE-SU-2022:0803-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | python-lxml +1 | 3.2.1-4.amzn2.0.4 | ALAS2-2023-1956 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | python-lxml | 4.8.0-1 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | lxml | < 4.2.5 | 4.2.5 | GHSA-xp26-p53h-6h2p |
Advisories 8
- DLA-2467-1 lxml - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3841-1 lxml vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2022:0895-1 Security update for python-lxml SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:1729-1 Security update for ardana-barbican, grafana, openstack-barbican, openstack-cinder, openstack-heat-gbp, openstack-horizon-plugin-gbp-ui, openstack-ironic, openstack-keystone, openstack-neutron-gbp, python-lxml, release-notes-suse-openstack-cloud SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0803-1 Security update for python-lxml SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0803-1 Security update for python-lxml SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-1086 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 19, 2025
- ALAS2-2023-1956 Important: python-lxml security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Mar 7, 2025
References
- USN-3841-1 vendor-advisory
- [debian-lts-announce] 20181210 [SECURITY] [DLA 1604-1] lxml security update mailing-list
- USN-3841-2 vendor-advisory
- https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109
- [debian-lts-announce] 20201126 [SECURITY] [DLA 2467-1] lxml security update mailing-list