Vulnerability-Lookup

CNVD-2021-100235

Vulnerability from cnvd - Published: 2021-12-16

Title

lxml注入漏洞

Description

Lxml是Lxml个人开发者的一个可与Python交互用于定位Html中元素的软件。 lxml 4.6.5之前版本存在注入漏洞，该漏洞源于HTML Cleaner允许某些精心制作的脚本内容以及使用数据URI嵌入的SVG文件中的脚本内容通过。目前没有详细的漏洞细节提供。

Severity

高

Patch Name

lxml注入漏洞的补丁

Patch Description

Lxml是Lxml个人开发者的一个可与Python交互用于定位Html中元素的软件。 lxml 4.6.5之前版本存在注入漏洞，该漏洞源于HTML Cleaner允许某些精心制作的脚本内容以及使用数据URI嵌入的SVG文件中的脚本内容通过。目前没有详细的漏洞细节提供。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://github.com/lxml/lxml/security/advisories/GHSA-55x5-fj6c-h6m8

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-43818

Impacted products

Name
lxml lxml <4.6.5

Show details on source website

JSON

To clipboard

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}

CVE-2021-43818 (GCVE-0-2021-43818)

Vulnerability from cvelistv5 – Published: 2021-12-13 18:05 – Updated: 2025-12-18 15:05

Title

HTML Cleaner allows crafted and SVG embedded scripts to pass through

Summary

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.

Severity

8.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-18 15:05 UTC

CWE

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

Assigner

GitHub_M mitre root

References

14 references

URL	Tags
https://github.com/lxml/lxml/security/advisories/…	x_refsource_CONFIRM
https://github.com/lxml/lxml/commit/12fa966900718…	x_refsource_MISC
https://github.com/lxml/lxml/commit/a3eacbc0dcf1d…	x_refsource_MISC
https://github.com/lxml/lxml/commit/f2330237440df…	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST
https://www.debian.org/security/2022/dsa-5043	vendor-advisoryx_refsource_DEBIAN
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://www.oracle.com/security-alerts/cpuapr2022.html	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2022010…	x_refsource_CONFIRM
https://www.oracle.com/security-alerts/cpujul2022.html	x_refsource_MISC
https://security.gentoo.org/glsa/202208-06	vendor-advisoryx_refsource_GENTOO

Impacted products

1 product

Vendor	Product	Version
lxml	lxml	Affected: < 4.6.5

Show details on NVD website

JSON

To clipboard

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              "refsource": "MISC",
              "url": "https://github.com/lxml/lxml/commit/f2330237440df7e8f39c3ad1b1aa8852be3b27c0"
            },
            {
              "name": "FEDORA-2021-6e8fb79f90",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZQ4SPKJX3RRJK4UWA6FXCRHD2TVRQI44/"
            },
            {
              "name": "FEDORA-2021-9f9e7c5c4f",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WZGNET2A4WGLSUXLBFYKNC5PXHQMI3I7/"
            },
            {
              "name": "[debian-lts-announce] 20211230 [SECURITY] [DLA 2871-1] lxml security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2021/12/msg00037.html"
            },
            {
              "name": "DSA-5043",
              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2022/dsa-5043"
            },
            {
              "name": "FEDORA-2022-96c79bf003",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TUIS2KE3HZ2AAQKXFLTJFZPP2IFHJTC7/"
            },
            {
              "name": "FEDORA-2022-7129fbaeed",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/V2XMOM5PFT6U5AAXY6EFNT5JZCKKHK2V/"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpuapr2022.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20220107-0005/",
              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20220107-0005/"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpujul2022.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpujul2022.html"
            },
            {
              "name": "GLSA-202208-06",
              "refsource": "GENTOO",
              "url": "https://security.gentoo.org/glsa/202208-06"
            }
          ]
        },
        "source": {
          "advisory": "GHSA-55x5-fj6c-h6m8",
          "discovery": "UNKNOWN"
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2021-43818",
    "datePublished": "2021-12-13T18:05:12.000Z",
    "dateReserved": "2021-11-16T00:00:00.000Z",
    "dateUpdated": "2025-12-18T15:05:59.477Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CNVD-2021-100235

CVE-2021-43818 (GCVE-0-2021-43818)

Tags

Sightings

Nomenclature

Related by attack behaviour