UBUNTU-CVE-2021-43818

    Dashboard / Vulnerabilities / UBUNTU-CVE-2021-43818

    UBUNTU-CVE-2021-43818

    Published: 13 Dec 2021Last Modified: 5 Feb 2026
    Upstream:
    CVE-2021-43818
    Aliases:
    USN-5225-1

    Summary:

    Details: 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://ubuntu.com/security/CVE-2021-43818, https://github.com/lxml/lxml/security/advisories/GHSA-55x5-fj6c-h6m8, https://github.com/lxml/lxml/commit/12fa9669007180a7bb87d990c375cf91ca5b664a, https://github.com/lxml/lxml/commit/f2330237440df7e8f39c3ad1b1aa8852be3b27c0, https://github.com/lxml/lxml/commit/f2330237440df7e8f39c3ad1b1aa8852be3b27c0, https://github.com/lxml/lxml/commit/a3eacbc0dcf1de1c822ec29fb7d090a4b1712a9c#diff-59130575b4fb2932c957db2922977d7d89afb0b2085357db1a14615a2fcad776, https://github.com/lxml/lxml/commit/12fa9669007180a7bb87d990c375cf91ca5b664a, https://ubuntu.com/security/notices/USN-5225-1, https://www.cve.org/CVERecord?id=CVE-2021-43818

    Affected packages

    Package

    Name: lxml

    Purl: pkg:deb/ubuntu/[email protected]+esm5?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.3.3-1ubuntu0.2+esm5

    Affected versions

    3.2.0-1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2021-43818 | CVE-DB