CVE-2020-1747
A vulnerability was discovered in the PyYAML library in versions before 5.3.1, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method
02 Description
A vulnerability was discovered in the PyYAML library in versions before 5.3.1, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 5.44% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 92.6% of scored records. A rank, not a probability.
- NVD base score
- 9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2020-03-24 13:56Z6 YR AGO
- Last updated
- 2024-08-04 06:46Z2 YR AGO
- Reserved
- 2019-11-27
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.8)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-20Improper Input ValidationClass
- Data version
- 5.1
- Document digest
- 6ce5c9664ecb4a6ee97998ed46f9dae37e750edec0514d029c4ab97e26d4bb50
05 Affected products
06 References
- lists.fedoraproject.orgFEDORA-2020-40c35d7b37https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WORRFHPQVAFKKXXWLSSW6XKUYLWM6CSH/
- lists.fedoraproject.orgFEDORA-2020-bdb0bfa928https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBJA3SGNJKCAYPSHOHWY3KBCWNM5NYK2/
- lists.fedoraproject.orgFEDORA-2020-e9741a6a15https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K5HEPD7LEVDPCITY5IMDYWXUMX37VFMY/
- lists.opensuse.orgopenSUSE-SU-2020:0507http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00017.html
- lists.opensuse.orgopenSUSE-SU-2020:0630http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00017.html
- lists.fedoraproject.orgFEDORA-2021-3342569a0fhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MMQXSZXNJT6ERABJZAAICI3DQSQLCP3D/
- lists.fedoraproject.orgFEDORA-2021-eed7193502https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7PPAS6C4SZRDQLR7C22A5U3QOLXY33JX/
- www.oracle.comhttps://www.oracle.com/security-alerts/cpujul2022.html
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1747
- github.comhttps://github.com/yaml/pyyaml/pull/386
07 Fixed in
AlmaLinux 8
- python38-Cython Fixed in 0.29.14-4.module_el8.6.0+2778+cd494b30
- python38-PyMySQL Fixed in 0.10.1-1.module_el8.6.0+2778+cd494b30
- python38-asn1crypto Fixed in 1.2.0-3.module_el8.6.0+2778+cd494b30
- python38-atomicwrites Fixed
A version is affected if any line below covers it.
- Affected before 1.3.0-8.module_el8.4.0+2510+cb4d423d
- Affected before 1.3.0-8.module_el8.6.0+2778+cd494b30
- python38-attrs Fixed
A version is affected if any line below covers it.
- Affected before 19.3.0-3.module_el8.4.0+2510+cb4d423d
- Affected before 19.3.0-3.module_el8.6.0+2778+cd494b30
- python38-cffi Fixed in 1.13.2-3.module_el8.6.0+2778+cd494b30
- python38-chardet Fixed in 3.0.4-19.module_el8.6.0+2778+cd494b30
- python38-cryptography Fixed in 2.8-3.module_el8.6.0+2778+cd494b30
- python38-idna Fixed in 2.8-6.module_el8.6.0+2778+cd494b30
- python38-markupsafe Fixed in 1.1.1-6.module_el8.6.0+2778+cd494b30
- python38-mod_wsgi Fixed in 4.6.8-3.module_el8.6.0+2778+cd494b30
- python38-more-itertools Fixed
A version is affected if any line below covers it.
- Affected before 7.2.0-5.module_el8.4.0+2510+cb4d423d
- Affected before 7.2.0-5.module_el8.6.0+2778+cd494b30
- python38-packaging Fixed
A version is affected if any line below covers it.
- Affected before 19.2-3.module_el8.4.0+2510+cb4d423d
- Affected before 19.2-3.module_el8.6.0+2778+cd494b30
- python38-pluggy Fixed
A version is affected if any line below covers it.
- Affected before 0.13.0-3.module_el8.4.0+2510+cb4d423d
- Affected before 0.13.0-3.module_el8.6.0+2778+cd494b30
- python38-ply Fixed in 3.11-10.module_el8.6.0+2778+cd494b30
- python38-psycopg2 Fixed in 2.8.4-4.module_el8.6.0+2778+cd494b30
- python38-psycopg2-doc Fixed in 2.8.4-4.module_el8.6.0+2778+cd494b30
- python38-psycopg2-tests Fixed in 2.8.4-4.module_el8.6.0+2778+cd494b30
- python38-py Fixed
A version is affected if any line below covers it.
- Affected before 1.8.0-8.module_el8.4.0+2510+cb4d423d
- Affected before 1.8.0-8.module_el8.6.0+2778+cd494b30
- python38-pycparser Fixed in 2.19-3.module_el8.6.0+2778+cd494b30
- python38-pyparsing Fixed
A version is affected if any line below covers it.
- Affected before 2.4.5-3.module_el8.4.0+2510+cb4d423d
- Affected before 2.4.5-3.module_el8.6.0+2778+cd494b30
- python38-pysocks Fixed in 1.7.1-4.module_el8.6.0+2778+cd494b30
- python38-pytest Fixed
A version is affected if any line below covers it.
- Affected before 4.6.6-3.module_el8.4.0+2510+cb4d423d
- Affected before 4.6.6-3.module_el8.6.0+2778+cd494b30
- python38-pytz Fixed in 2019.3-3.module_el8.6.0+2778+cd494b30
- python38-pyyaml Fixed in 5.4.1-1.module_el8.6.0+2778+cd494b30
- python38-requests Fixed in 2.22.0-9.module_el8.6.0+2778+cd494b30
- python38-scipy Fixed in 1.3.1-4.module_el8.6.0+2778+cd494b30
- python38-six Fixed in 1.12.0-10.module_el8.6.0+2778+cd494b30
- python38-wcwidth Fixed
A version is affected if any line below covers it.
- Affected before 0.1.7-16.module_el8.4.0+2510+cb4d423d
- Affected before 0.1.7-16.module_el8.6.0+2778+cd494b30
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- python38-Cython Fixed in 0.29.14-4.module_el8.6.0+2778+cd494b30
- python38-PyMySQL Fixed in 0.10.1-1.module_el8.6.0+2778+cd494b30
- python38-asn1crypto Fixed in 1.2.0-3.module_el8.6.0+2778+cd494b30
- python38-atomicwrites Fixed
A version is affected if any line below covers it.
- Affected before 1.3.0-8.module_el8.4.0+2510+cb4d423d
- Affected before 1.3.0-8.module_el8.6.0+2778+cd494b30
- python38-attrs Fixed
A version is affected if any line below covers it.
- Affected before 19.3.0-3.module_el8.4.0+2510+cb4d423d
- Affected before 19.3.0-3.module_el8.6.0+2778+cd494b30
- python38-cffi Fixed in 1.13.2-3.module_el8.6.0+2778+cd494b30
- python38-chardet Fixed in 3.0.4-19.module_el8.6.0+2778+cd494b30
- python38-cryptography Fixed in 2.8-3.module_el8.6.0+2778+cd494b30
- python38-idna Fixed in 2.8-6.module_el8.6.0+2778+cd494b30
- python38-markupsafe Fixed in 1.1.1-6.module_el8.6.0+2778+cd494b30
- python38-mod_wsgi Fixed in 4.6.8-3.module_el8.6.0+2778+cd494b30
- python38-more-itertools Fixed
A version is affected if any line below covers it.
- Affected before 7.2.0-5.module_el8.4.0+2510+cb4d423d
- Affected before 7.2.0-5.module_el8.6.0+2778+cd494b30
- python38-packaging Fixed
A version is affected if any line below covers it.
- Affected before 19.2-3.module_el8.4.0+2510+cb4d423d
- Affected before 19.2-3.module_el8.6.0+2778+cd494b30
- python38-pluggy Fixed
A version is affected if any line below covers it.
- Affected before 0.13.0-3.module_el8.4.0+2510+cb4d423d
- Affected before 0.13.0-3.module_el8.6.0+2778+cd494b30
- python38-ply Fixed in 3.11-10.module_el8.6.0+2778+cd494b30
- python38-psycopg2 Fixed in 2.8.4-4.module_el8.6.0+2778+cd494b30
- python38-psycopg2-doc Fixed in 2.8.4-4.module_el8.6.0+2778+cd494b30
- python38-psycopg2-tests Fixed in 2.8.4-4.module_el8.6.0+2778+cd494b30
- python38-py Fixed
A version is affected if any line below covers it.
- Affected before 1.8.0-8.module_el8.4.0+2510+cb4d423d
- Affected before 1.8.0-8.module_el8.6.0+2778+cd494b30
- python38-pycparser Fixed in 2.19-3.module_el8.6.0+2778+cd494b30
- python38-pyparsing Fixed
A version is affected if any line below covers it.
- Affected before 2.4.5-3.module_el8.4.0+2510+cb4d423d
- Affected before 2.4.5-3.module_el8.6.0+2778+cd494b30
- python38-pysocks Fixed in 1.7.1-4.module_el8.6.0+2778+cd494b30
- python38-pytest Fixed
A version is affected if any line below covers it.
- Affected before 4.6.6-3.module_el8.4.0+2510+cb4d423d
- Affected before 4.6.6-3.module_el8.6.0+2778+cd494b30
- python38-pytz Fixed in 2019.3-3.module_el8.6.0+2778+cd494b30
- python38-pyyaml Fixed in 5.4.1-1.module_el8.6.0+2778+cd494b30
- python38-requests Fixed in 2.22.0-9.module_el8.6.0+2778+cd494b30
- python38-scipy Fixed in 1.3.1-4.module_el8.6.0+2778+cd494b30
- python38-six Fixed in 1.12.0-10.module_el8.6.0+2778+cd494b30
- python38-wcwidth Fixed
A version is affected if any line below covers it.
- Affected before 0.1.7-16.module_el8.4.0+2510+cb4d423d
- Affected before 0.1.7-16.module_el8.6.0+2778+cd494b30
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- pyyaml Fixed in 5.3-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- pyyaml Fixed in 5.3-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- pyyaml Fixed in 5.3-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.