ms-swift up to 3.6.3 PyYAML deserialization

Summaryinfo

A vulnerability categorized as critical has been discovered in ms-swift up to 3.6.3. Affected is an unknown function of the component PyYAML Handler. The manipulation results in deserialization. This vulnerability was named CVE-2025-50460. The attack may be performed from remote. In addition, an exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in ms-swift up to 3.6.3. Affected is an unknown functionality of the component PyYAML Handler. The manipulation with an unknown input leads to a deserialization vulnerability. CWE is classifying the issue as CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A remote code execution (RCE) vulnerability exists in the ms-swift project version 3.3.0 due to unsafe deserialization in tests/run.py using yaml.load() from the PyYAML library (versions = 5.3.1). If an attacker can control the content of the YAML configuration file passed to the --run_config parameter, arbitrary code can be executed during deserialization. This can lead to full system compromise. The vulnerability is triggered when a malicious YAML file is loaded, allowing the execution of arbitrary Python commands such as os.system(). It is recommended to upgrade PyYAML to version 5.4 or higher, and to use yaml.safe_load() to mitigate the issue.

The advisory is available at github.com. This vulnerability is traded as CVE-2025-50460 since 06/16/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are unknown but a public exploit is available.

The exploit is shared for download at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• ms-swift

Version

• 3.6.0
• 3.6.1
• 3.6.2
• 3.6.3

CPE 2.3info

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CPE 2.2info

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