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CVE-2016-9243 · cross-distro fix matrix

CVE-2016-9243: HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.

Affects 3 Linux releases across 3 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2016-9243 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

  • python-cryptography→ fixed in1.5.3-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y python-cryptography

Debian bookworm

Source: Debian Security Tracker

  • python-cryptography→ fixed in1.5.3-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y python-cryptography

Debian trixie

Source: Debian Security Tracker

  • python-cryptography→ fixed in1.5.3-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y python-cryptography
Are YOU affected by CVE-2016-9243?

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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