CVE-2021-43818 (GCVE-0-2021-43818)
Vulnerability from cvelistv5
Published
2021-12-13 18:05
Modified
2025-12-18 15:05
Severity ?
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N
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')
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.
References
https://github.com/lxml/lxml/security/advisories/GHSA-55x5-fj6c-h6m8 x_refsource_CONFIRM
https://github.com/lxml/lxml/commit/12fa9669007180a7bb87d990c375cf91ca5b664a x_refsource_MISC
https://github.com/lxml/lxml/commit/a3eacbc0dcf1de1c822ec29fb7d090a4b1712a9c#diff-59130575b4fb2932c957db2922977d7d89afb0b2085357db1a14615a2fcad776 x_refsource_MISC
https://github.com/lxml/lxml/commit/f2330237440df7e8f39c3ad1b1aa8852be3b27c0 x_refsource_MISC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZQ4SPKJX3RRJK4UWA6FXCRHD2TVRQI44/ vendor-advisory, x_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WZGNET2A4WGLSUXLBFYKNC5PXHQMI3I7/ vendor-advisory, x_refsource_FEDORA
https://lists.debian.org/debian-lts-announce/2021/12/msg00037.html mailing-list, x_refsource_MLIST
https://www.debian.org/security/2022/dsa-5043 vendor-advisory, x_refsource_DEBIAN
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TUIS2KE3HZ2AAQKXFLTJFZPP2IFHJTC7/ vendor-advisory, x_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V2XMOM5PFT6U5AAXY6EFNT5JZCKKHK2V/ vendor-advisory, x_refsource_FEDORA
https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
https://security.netapp.com/advisory/ntap-20220107-0005/ x_refsource_CONFIRM
https://www.oracle.com/security-alerts/cpujul2022.html x_refsource_MISC
https://security.gentoo.org/glsa/202208-06 vendor-advisory, x_refsource_GENTOO
Impacted products
Vendor Product Version
lxml lxml Version: < 4.6.5
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