CVE-2021-43818

NameCVE-2021-43818
Descriptionlxml 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2871-1, DSA-5043-1, ELA-536-1
NVD severitymedium
Debian Bugs1001885

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
lxml (PTS)jessie, jessie (lts)3.4.0-1+deb8u5fixed
stretch3.7.1-1vulnerable
stretch (security)3.7.1-1+deb9u5fixed
buster4.3.2-1+deb10u3vulnerable
buster (security)4.3.2-1+deb10u4fixed
bullseye4.6.3+dfsg-0.1vulnerable
bullseye (security)4.6.3+dfsg-0.1+deb11u1fixed
sid, bookworm4.7.1-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
lxmlsourcejessie3.4.0-1+deb8u5ELA-536-1
lxmlsourcestretch3.7.1-1+deb9u5DLA-2871-1
lxmlsourcebuster4.3.2-1+deb10u4DSA-5043-1
lxmlsourcebullseye4.6.3+dfsg-0.1+deb11u1DSA-5043-1
lxmlsource(unstable)4.7.1-11001885

Notes

https://github.com/lxml/lxml/security/advisories/GHSA-55x5-fj6c-h6m8
https://github.com/lxml/lxml/commit/12fa9669007180a7bb87d990c375cf91ca5b664a (lxml-4.6.5)
https://github.com/lxml/lxml/commit/f2330237440df7e8f39c3ad1b1aa8852be3b27c0 (lxml-4.6.5)

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