CVE-2019-20477 · cross-distro fix matrix

CVE-2019-20477: PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.

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

Fix per ecosystem

Each block below is a distro release where CVE-2019-20477 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

pyyaml→ fixed in5.2-1urgency: unimportant

sudo apt-get install --only-upgrade -y pyyaml

Debian bookworm

Source: Debian Security Tracker

pyyaml→ fixed in5.2-1urgency: unimportant

sudo apt-get install --only-upgrade -y pyyaml

Debian trixie

Source: Debian Security Tracker

pyyaml→ fixed in5.2-1urgency: unimportant

sudo apt-get install --only-upgrade -y pyyaml

Are YOU affected by CVE-2019-20477?

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

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

CVE-2019-20477dropped 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.

See StackPatch ($99 lifetime)