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.
YAML parser and emitter for Python
Library home page: https://files.pythonhosted.org/packages/64/c2/b80047c7ac2478f9501676c988a5411ed5572f35d1beff9cae07d321512c/PyYAML-5.3.1.tar.gz
Path to dependency file: /requirements.txt
Path to vulnerable library: /tmp/ws-ua_20241115002033_WTNZFN/python_PBEMYZ/202411150020341/env/lib/python3.8/site-packages/PyYAML-5.3.1.dist-info
Found in HEAD commit: 8ddb17db2e92b50469f9ac2f9b50924da3251d13
Vulnerabilities
**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation
Details
CVE-2020-14343
### Vulnerable Library - PyYAML-5.3.1.tar.gzYAML parser and emitter for Python
Library home page: https://files.pythonhosted.org/packages/64/c2/b80047c7ac2478f9501676c988a5411ed5572f35d1beff9cae07d321512c/PyYAML-5.3.1.tar.gz
Path to dependency file: /requirements.txt
Path to vulnerable library: /tmp/ws-ua_20241115002033_WTNZFN/python_PBEMYZ/202411150020341/env/lib/python3.8/site-packages/PyYAML-5.3.1.dist-info
Dependency Hierarchy: - :x: **PyYAML-5.3.1.tar.gz** (Vulnerable Library)
Found in HEAD commit: 8ddb17db2e92b50469f9ac2f9b50924da3251d13
Found in base branch: main
### Vulnerability DetailsA 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.
Publish Date: 2021-02-09
URL: CVE-2020-14343
### CVSS 3 Score Details (9.8)Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: Low - Privileges Required: None - User Interaction: None - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: High - Integrity Impact: High - Availability Impact: High
For more information on CVSS3 Scores, click here. ### Suggested FixType: Upgrade version
Origin: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14343
Release Date: 2021-02-09
Fix Resolution: PyYAML - 5.4
:rescue_worker_helmet: Automatic Remediation will be attempted for this issue.:rescue_worker_helmet:Automatic Remediation will be attempted for this issue.