PYSEC-2021-852

    Dashboard / Vulnerabilities / PYSEC-2021-852

    PYSEC-2021-852

    Published: 13 Dec 2021Last Modified: 9 Apr 2026

    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://github.com/lxml/lxml/commit/f2330237440df7e8f39c3ad1b1aa8852be3b27c0, https://github.com/lxml/lxml/commit/a3eacbc0dcf1de1c822ec29fb7d090a4b1712a9c#diff-59130575b4fb2932c957db2922977d7d89afb0b2085357db1a14615a2fcad776, https://github.com/lxml/lxml/security/advisories/GHSA-55x5-fj6c-h6m8, https://github.com/lxml/lxml/commit/12fa9669007180a7bb87d990c375cf91ca5b664a

    Affected packages

    Package

    Name: lxml

    Purl: pkg:pypi/lxml

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -f2330237440df7e8f39c3ad1b1aa8852be3b27c0

    Affected versions

    0.9
    0.9.1
    0.9.2

    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
    PYSEC-2021-852 | CVE-DB