high
8.8
CWE
74 79 77
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2021-43818: HTML Cleaner allows crafted and SVG embedded scripts to pass through

First published: Sun Dec 12 2021(Updated: )

### Impact The HTML Cleaner in lxml.html lets certain crafted script content pass through, as well as script content in SVG files embedded using data URIs. Users that employ the HTML cleaner in a security relevant context should upgrade to lxml 4.6.5. ### Patches The issue has been resolved in lxml 4.6.5. ### Workarounds None. ### References The issues are tracked under the report IDs GHSL-2021-1037 and GHSL-2021-1038.

Credit: security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
redhat/python-lxml<0:4.2.3-4.el8
0:4.2.3-4.el8
redhat/python-lxml<0:4.7.1-1.el8
0:4.7.1-1.el8
redhat/rh-python38-python-lxml<0:4.4.1-8.el7
0:4.4.1-8.el7
debian/lxml
4.3.2-1+deb10u4
4.6.3+dfsg-0.1+deb11u1
4.9.2-1
4.9.3-1
Lxml Lxml<4.6.5
Fedoraproject Fedora=34
Fedoraproject Fedora=35
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Debian Debian Linux=11.0
Netapp Solidfire
Netapp Solidfire Enterprise Sds
Netapp Hci Storage Node Firmware
Netapp Hci Storage Node
Oracle Communications Cloud Native Core Binding Support Function=22.1.3
Oracle Communications Cloud Native Core Network Exposure Function=22.1.1
Oracle Communications Cloud Native Core Policy=22.2.0
Oracle HTTP Server=12.2.1.3.0
Oracle HTTP Server=12.2.1.4.0
Oracle ZFS Storage Appliance Kit=8.8
redhat/python-lxml<4.6.5
4.6.5
IBM QRadar SIEM<=7.5 - 7.5.0 UP8 IF01
pip/lxml<4.6.5
4.6.5
All of
Netapp Hci Storage Node Firmware
Netapp Hci Storage Node

Remedy

https://github.com/lxml/lxml/commit/12fa9669007180a7bb87d990c375cf91ca5b664a

Remedy

https://github.com/lxml/lxml/commit/a3eacbc0dcf1de1c822ec29fb7d090a4b1712a9c#diff-59130575b4fb2932c957db2922977d7d89afb0b2085357db1a14615a2fcad776

Remedy

https://github.com/lxml/lxml/commit/f2330237440df7e8f39c3ad1b1aa8852be3b27c0

Remedy

https://www.oracle.com/security-alerts/cpuapr2022.html

Remedy

https://www.oracle.com/security-alerts/cpujul2022.html

Remedy

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-43818?

    CVE-2021-43818 is a vulnerability in python-lxml's HTML Cleaner component that allows an attacker to trigger script execution in clients.

  • How does CVE-2021-43818 affect python-lxml?

    CVE-2021-43818 affects python-lxml versions prior to 4.6.5.

  • What is the severity of CVE-2021-43818?

    CVE-2021-43818 has a severity rating of 8.8 (High).

  • How can the CVE-2021-43818 vulnerability be fixed?

    To fix the CVE-2021-43818 vulnerability, upgrade python-lxml to version 4.6.5 or higher.

  • Where can I find more information about CVE-2021-43818?

    You can find more information about CVE-2021-43818 at the following references: [link1], [link2], [link3].

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