CVE-2020-14343
Critical
Description
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.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Pyyaml
PublishedFeb 9, 2021
First seenFeb 9, 2021
Weakness typeCWE-20Improper input validation
How to fix
Update
- pyyaml pyyaml5.4 or later
- pyyaml5.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pyyaml pyyaml | 5.1 ≤ v < 5.4 | 5.4 |
| oracle communications_cloud_native_core_network_function_cloud_native_environment | 1.10.0, 22.1.0 | — |
| pyyamlPyPI | v < 5.4 | 5.4 |
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