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01 Record

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

UnratedPUBLISHEDCNA: mitre
CNA base scoreUnratedNo CNA CVSS vector
View raw JSON

02 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

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
5.11% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 91.9% 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
2020-02-19 03:09Z6 YR AGO
Last updated
2024-08-05 02:39Z2 YR AGO
Reserved
2020-02-19
Assigning CNA
mitre
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-502Deserialization of Untrusted DataBase
Data version
5.1
Document digest
bc7ded9e63c176136b5d42ce685e5a9c3625019eb5e80c094dcf1c53c38de986

05 Affected products

VendorProductVersionsPlatforms
fedoraprojectfedoraNot specified—
pyyamlpyyamlNot specified—
redhatenterprise_linuxNot specified—
redhatopenstackNot specified—
redhatquayNot specified—
redhatrhel_software_collectionsNot specified—

06 References

07 Fixed in

AlmaLinux 8

  • python38-Cython
    Fixed in 0.29.14-4.module_el8.6.0+2778+cd494b30
  • python38-asn1crypto
    Fixed in 1.2.0-3.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-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-pycparser
    Fixed in 2.19-3.module_el8.6.0+2778+cd494b30
  • python38-pysocks
    Fixed in 1.7.1-4.module_el8.6.0+2778+cd494b30
  • python38-pytz
    Fixed in 2019.3-3.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

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-asn1crypto
    Fixed in 1.2.0-3.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-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-pycparser
    Fixed in 2.19-3.module_el8.6.0+2778+cd494b30
  • python38-pysocks
    Fixed in 1.7.1-4.module_el8.6.0+2778+cd494b30
  • python38-pytz
    Fixed in 2019.3-3.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

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 5.2-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • pyyaml
    Fixed in 5.2-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • pyyaml
    Fixed in 5.2-1

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.