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CVE-2021-43818 · cross-distro fix matrix

CVE-2021-43818: 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 con

Affects 8 Linux releases across 8 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-43818 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

  • lxml→ fixed in4.6.3+dfsg-0.1+deb11u1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y lxml

Debian bookworm

Source: Debian Security Tracker

  • lxml→ fixed in4.7.1-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y lxml

Debian trixie

Source: Debian Security Tracker

  • lxml→ fixed in4.7.1-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y lxml

Alpine v3.20

Source: Alpine secdb

  • py3-lxml→ fixed in4.6.5-r0
    apk update && apk add --upgrade py3-lxml

Alpine v3.21

Source: Alpine secdb

  • py3-lxml→ fixed in4.6.5-r0
    apk update && apk add --upgrade py3-lxml

Alpine edge

Source: Alpine secdb

  • py3-lxml→ fixed in4.6.5-r0
    apk update && apk add --upgrade py3-lxml

Alpine v3.18

Source: Alpine secdb

  • py3-lxml→ fixed in4.6.5-r0
    apk update && apk add --upgrade py3-lxml

Alpine v3.19

Source: Alpine secdb

  • py3-lxml→ fixed in4.6.5-r0
    apk update && apk add --upgrade py3-lxml
Are YOU affected by CVE-2021-43818?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash
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CVE-2021-43818dropped silently in your distro's update channel. Every new CVE is the same story. StackPatch runs the matcher hourly against all 5 sources and emails the exact remediation when something new applies to one of your servers. $99 lifetime, 50 founder seats, 30-day refund.

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