Deserialization of Untrusted Data Affecting ms-swift package, versions [,3.0.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published7 Aug 2025
- disclosed1 Aug 2025
- creditHao Fan, Yu Rong
Introduced: 1 Aug 2025
CVE-2025-50472 (opens in a new tab)How to fix?
Upgrade ms-swift to version 3.0.0 or higher.
Overview
ms-swift is a Swift: Scalable lightWeight Infrastructure for Fine-Tuning
Affected versions of this package are vulnerable to Deserialization of Untrusted Data via the load_model_meta function. An attacker can execute arbitrary code by supplying a maliciously crafted serialized .mdl file that is deserialized using pickle.load from untrusted sources.
Note:
This is only exploitable if a user loads a model checkpoint file that has been tampered with by an attacker, typically during a normal training process, without being aware of the malicious payload.
Details
Serialization is a process of converting an object into a sequence of bytes which can be persisted to a disk or database or can be sent through streams. The reverse process of creating object from sequence of bytes is called deserialization. Serialization is commonly used for communication (sharing objects between multiple hosts) and persistence (store the object state in a file or a database). It is an integral part of popular protocols like Remote Method Invocation (RMI), Java Management Extension (JMX), Java Messaging System (JMS), Action Message Format (AMF), Java Server Faces (JSF) ViewState, etc.
Deserialization of untrusted data (CWE-502) is when the application deserializes untrusted data without sufficiently verifying that the resulting data will be valid, thus allowing the attacker to control the state or the flow of the execution.