| Name | CVE-2019-20477 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| pyyaml (PTS) | jessie | 3.11-2 | fixed |
| stretch | 3.12-1 | fixed |
| buster | 3.13-2 | fixed |
| bullseye | 5.3.1-5 | fixed |
| bookworm | 6.0-3 | fixed |
| sid, trixie | 6.0.2-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| pyyaml | source | jessie | (not affected) | | | |
| pyyaml | source | stretch | (not affected) | | | |
| pyyaml | source | buster | (not affected) | | | |
| pyyaml | source | (unstable) | 5.2-1 | unimportant | | |
Notes
[buster] - pyyaml <not-affected> (Vulnerability introduced in 5.1)
[stretch] - pyyaml <not-affected> (Vulnerability introduced in 5.1)
[jessie] - pyyaml <not-affected> (Vulnerability introduced in 5.1)
CVE exists due to an incomplete fix for CVE-2017-18342.