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TI-2020-11214 Aliases CVE-2020-14343GHSA-8q59-q68h-6hv4

Improper input validation in PyYAML

Priority MEDIUM 51CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 4 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.

Summary

A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method or with the FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this flaw. This flaw allows an attacker to execute arbitrary code on the system by abusing the python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747.

Why it matters now

EPSS 0.0624 93rd percentileScored 2026-11-07
Fix Partial PyYAML (PyPI): 5.4Red Hat: 2 advisoriesRed Hat: 4 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—PyYAMLPyYAML 5.4—No fix listedCNA
—PyYAML (PyPI)before 5.45.4Patch availableGHSA-8q59-q68h-6hv4
  • PyYAML Vendor— Affected PyYAML 5.4 Fixed in — No fix listed CNA
  • PyYAML (PyPI) Vendor— Affected before 5.4 Fixed in 5.4 Patch available GHSA-8q59-q68h-6hv4

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:pyyaml:pyyaml:*:*:*:*:*:*:*:*5.1 to before 5.4VulnerablePyyaml
cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:*1.10.0VulnerableOracle
cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:22.1.0:*:*:*:*:*:*:*22.1.0VulnerableOracle
  • cpe:2.3:a:pyyaml:pyyaml:*:*:*:*:*:*:*:* Versions 5.1 to before 5.4 Vulnerable ·Pyyaml
  • cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:* Versions 1.10.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:22.1.0:*:*:*:*:*:*:* Versions 22.1.0 Vulnerable ·Oracle

Remediation

  • Fix · GHSA-8q59-q68h-6hv4 PyYAML (PyPI) Fixed in 5.4 Advisory →

Red Hat 2 advisories

  • RHSA-2021:4702 Released 2021-11-16 · Red Hat rating Moderate
    Satellite 6.10 Release
    • Red Hat Satellite 6.10 candlepin-4.0.9-1.el7sat, foreman-2.5.2.17-2.el7sat, python-aiohttp-3.7.4-1.el7pc +14
    • Red Hat Satellite Capsule 6.10 foreman-2.5.2.17-2.el7sat, python-aiohttp-3.7.4-1.el7pc, python-ecdsa-0.13.3-2.el7pc +9
  • RHSA-2021:2583 Released 2021-06-29 · Red Hat rating Moderate
    python38:3.8 and python38-devel:3.8 security update
    • Red Hat CodeReady Linux Builder (v. 8) pytest-4.6.6-3.module+el8.4.0+8888+89bc7e79.src::python38-devel:3.8, python-atomicwrites-1.3.0-8.module+el8.4.0+8888+89bc7e79.src::python38-devel:3.8, python-attrs-19.3.0-3.module+el8.4.0+8888+89bc7e79.src::python38-devel:3.8 +15
    • Red Hat Enterprise Linux AppStream (v. 8) Cython-0.29.14-4.module+el8.4.0+8888+89bc7e79.src::python38:3.8, PyYAML-5.4.1-1.module+el8.4.0+10706+5c295a3e.src::python38:3.8, babel-2.7.0-10.module+el8.4.0+8888+89bc7e79.src::python38:3.8 +47

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Software CollectionsAffectedNo fix planned: Will not fix
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:2583
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:2583
Red Hat Satellite 6.10Fixed RHSA-2021:4702
Red Hat Satellite Capsule 6.10Fixed RHSA-2021:4702
Not affected: 11 products
  • Red Hat Ansible Tower 3
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat OpenStack Platform 10 (Newton)
  • Red Hat OpenStack Platform 13 (Queens)
  • Red Hat Quay 3
  • Red Hat Satellite 6.10
  • Red Hat Satellite Capsule 6.10
  • Red Hat Software Collections

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-14343
  2. 2026-10-03 Alias added: GHSA-8q59-q68h-6hv4

References

Patch 2

Advisory 3

Other 7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences