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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.

🗓️ 07 Nov 2023 08:00:00Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 6 Views

PyYAML pre-5.4 allows arbitrary code execution via untrusted YAML using full_load or FullLoader.

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Vulners
Node
microsoftcbl2_pyyaml_5.4.1-1Range<5.4.1-1

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07 Nov 2023 08:00Current
7High risk
Vulners AI Score7
CVSS 3.19.8
CVSS 210
EPSS0.05984
PyYAML vulnerabilityarbitrary code executionuntrusted inputfull_load methodFullLoader loader
6