CVE-2020-14343
Improper Input Validation in PyYAML
9.8
CRITICAL
CVSS 3.1
EPSS 13.7%
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.
How to fix CVE-2020-14343
To remediate CVE-2020-14343, upgrade the affected package to a fixed version below.
- —upgrade to 5.3.1-r1 or later
- —upgrade to 5.3.1-4 or later
- —upgrade to 5.4 or later
- —upgrade to 5.4 or later
Is CVE-2020-14343 being exploited?
Moderate — EPSS is 13.7%. Track this CVE but it's not at the top of the prioritisation list.
Affected packages (4)
- from 0, < 5.3.1-r1
- from 0, < 5.3.1-4
- from 0, < 5.4
- from 0, < 5.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |