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CVE-2021-21240 · cross-distro fix matrix

CVE-2021-21240: httplib2 is a comprehensive HTTP client library for Python. In httplib2 before version 0.19.0, a malicious server which responds with long series of "\xa0" characters in the "www-authenticate" header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said se

Affects 7 Linux releases across 7 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-21240 has a known fix. Run the listed command on that distro to remediate.

Debian bookworm

Source: Debian Security Tracker

  • python-httplib2→ fixed in0.20.2-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y python-httplib2

Debian trixie

Source: Debian Security Tracker

  • python-httplib2→ fixed in0.20.2-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y python-httplib2

Alpine v3.20

Source: Alpine secdb

  • py3-httplib2→ fixed in0.19.0-r0
    apk update && apk add --upgrade py3-httplib2

Alpine v3.21

Source: Alpine secdb

  • py3-httplib2→ fixed in0.19.0-r0
    apk update && apk add --upgrade py3-httplib2

Alpine edge

Source: Alpine secdb

  • py3-httplib2→ fixed in0.19.0-r0
    apk update && apk add --upgrade py3-httplib2

Alpine v3.18

Source: Alpine secdb

  • py3-httplib2→ fixed in0.19.0-r0
    apk update && apk add --upgrade py3-httplib2

Alpine v3.19

Source: Alpine secdb

  • py3-httplib2→ fixed in0.19.0-r0
    apk update && apk add --upgrade py3-httplib2
Are YOU affected by CVE-2021-21240?

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.

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