Deserialization of Untrusted Data Affecting epyt-flow package, versions [,0.16.1)
Threat Intelligence
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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- published5 Feb 2026
- disclosed4 Feb 2026
- creditJarrett Chan
Introduced: 4 Feb 2026
CVE-2026-25632 (opens in a new tab)How to fix?
Upgrade epyt-flow to version 0.16.1 or higher.
Overview
epyt-flow is an EPyT-Flow -- EPANET Python Toolkit - Flow
Affected versions of this package are vulnerable to Deserialization of Untrusted Data via the type parameter in my_load_from_json. An attacker can execute arbitrary code by supplying a malicious JSON body containing a __type__ field that triggers dynamic import and instantiation of attacker-controlled classes. This can be exploited remotely through the REST API.
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.