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CVE-2021-43818 Details

Description

lxml is a library for processing XML and HTML in the Python language. Prior to version 4.6.5, 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 to receive a patch. There are no known workarounds available.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

CNA: [email protected]CVSS-B:8.2 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
https://github.com/lxml/lxml/commit/12fa9669007180a7bb87d990c375cf91ca5b664a	CVE	PatchThird Party Advisory
https://github.com/lxml/lxml/commit/a3eacbc0dcf1de1c822ec29fb7d090a4b1712a9c#diff-59130575b4fb2932c957db2922977d7d89afb0b2085357db1a14615a2fcad776	CVE	PatchThird Party Advisory
https://github.com/lxml/lxml/commit/f2330237440df7e8f39c3ad1b1aa8852be3b27c0	CVE	PatchThird Party Advisory
https://github.com/lxml/lxml/security/advisories/GHSA-55x5-fj6c-h6m8	CVE	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00037.html	CVE	Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TUIS2KE3HZ2AAQKXFLTJFZPP2IFHJTC7/	CVE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V2XMOM5PFT6U5AAXY6EFNT5JZCKKHK2V/	CVE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WZGNET2A4WGLSUXLBFYKNC5PXHQMI3I7/	CVE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZQ4SPKJX3RRJK4UWA6FXCRHD2TVRQI44/	CVE
https://security.gentoo.org/glsa/202208-06	CVE	Third Party Advisory
https://security.netapp.com/advisory/ntap-20220107-0005/	CVE	Third Party Advisory
https://www.debian.org/security/2022/dsa-5043	CVE	Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html	CVE	PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html	CVE	PatchThird Party Advisory
https://github.com/lxml/lxml/commit/12fa9669007180a7bb87d990c375cf91ca5b664a	[email protected]	PatchThird Party Advisory
https://github.com/lxml/lxml/commit/a3eacbc0dcf1de1c822ec29fb7d090a4b1712a9c#diff-59130575b4fb2932c957db2922977d7d89afb0b2085357db1a14615a2fcad776	[email protected]	PatchThird Party Advisory
https://github.com/lxml/lxml/commit/f2330237440df7e8f39c3ad1b1aa8852be3b27c0	[email protected]	PatchThird Party Advisory
https://github.com/lxml/lxml/security/advisories/GHSA-55x5-fj6c-h6m8	[email protected]	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00037.html	[email protected]	Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TUIS2KE3HZ2AAQKXFLTJFZPP2IFHJTC7/	[email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V2XMOM5PFT6U5AAXY6EFNT5JZCKKHK2V/	[email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WZGNET2A4WGLSUXLBFYKNC5PXHQMI3I7/	[email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZQ4SPKJX3RRJK4UWA6FXCRHD2TVRQI44/	[email protected]
https://security.gentoo.org/glsa/202208-06	[email protected]	Third Party Advisory
https://security.netapp.com/advisory/ntap-20220107-0005/	[email protected]	Third Party Advisory
https://www.debian.org/security/2022/dsa-5043	[email protected]	Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html	[email protected]	PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html	[email protected]	PatchThird Party Advisory

see all 28 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	[email protected]
CWE-74	Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')	[email protected]
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	[email protected]

Affected Products

Product	Versions
lxml lxml	< 4.6.5
CPE cpe:2.3:a:lxml:lxml:::::::: Remediation No remediation found in references.
fedoraproject fedora	34 35
CPE cpe:2.3:o:fedoraproject:fedora:34:::::::* cpe:2.3:o:fedoraproject:fedora:35:::::::* Remediation No remediation found in references.
debian debian linux	9.0 10.0 11.0
CPE cpe:2.3:o:debian:debian_linux:9.0:::::::* cpe:2.3:o:debian:debian_linux:10.0:::::::* cpe:2.3:o:debian:debian_linux:11.0:::::::* Remediation No remediation found in references.
netapp solidfire	All versions
CPE cpe:2.3:a:netapp:solidfire:-:::::::* Remediation No remediation found in references.
netapp solidfire enterprise sds	All versions
CPE cpe:2.3:a:netapp:solidfire_enterprise_sds:-:::::::* Remediation No remediation found in references.
netapp hci storage node firmware	All versions
CPE cpe:2.3:o:netapp:hci_storage_node_firmware:-:::::::* Remediation No remediation found in references.
netapp hci storage node	All versions
CPE cpe:2.3:h:netapp:hci_storage_node:-:::::::* Remediation No remediation found in references.
oracle communications cloud native core binding support function	22.1.3
CPE cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:22.1.3:::::::* Remediation No remediation found in references.
oracle communications cloud native core network exposure function	22.1.1
CPE cpe:2.3:a:oracle:communications_cloud_native_core_network_exposure_function:22.1.1:::::::* Remediation No remediation found in references.
oracle communications cloud native core policy	22.2.0
CPE cpe:2.3:a:oracle:communications_cloud_native_core_policy:22.2.0:::::::* Remediation No remediation found in references.
oracle http server	12.2.1.3.0 12.2.1.4.0
CPE cpe:2.3:a:oracle:http_server:12.2.1.3.0:::::::* cpe:2.3:a:oracle:http_server:12.2.1.4.0:::::::* Remediation No remediation found in references.
oracle zfs storage appliance kit	8.8
CPE cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:::::::* Remediation No remediation found in references.

Change History

20 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Nov 7, 2023	CVE Modified	[email protected]
Dec 9, 2022	Modified Analysis	[email protected]
Aug 10, 2022	CVE Modified	[email protected]
Aug 9, 2022	Modified Analysis	[email protected]
Jul 25, 2022	CVE Modified	[email protected]
Jun 16, 2022	Modified Analysis	[email protected]
Apr 20, 2022	CVE Modified	[email protected]
Feb 10, 2022	Modified Analysis	[email protected]
Jan 23, 2022	CVE Modified	[email protected]
Jan 15, 2022	CVE Modified	[email protected]
Jan 13, 2022	CVE Modified	[email protected]
Jan 10, 2022	CVE Modified	[email protected]
Jan 4, 2022	Modified Analysis	[email protected]
Dec 30, 2021	CVE Modified	[email protected]
Dec 26, 2021	CVE Modified	[email protected]
Dec 16, 2021	Initial Analysis	[email protected]

CVE-2021-43818 Details

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