Deserialization of Untrusted Data Affecting python-socketio package, versions [0.8.0,5.14.0)
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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Start learning- Snyk IDSNYK-PYTHON-PYTHONSOCKETIO-13450297
- published9 Oct 2025
- disclosed6 Oct 2025
- creditAli Raza
Introduced: 6 Oct 2025
CVE-2025-61765 (opens in a new tab)How to fix?
Upgrade python-socketio to version 5.14.0 or higher.
Overview
python-socketio is a Socket.IO server and client for Python
Affected versions of this package are vulnerable to Deserialization of Untrusted Data via payloads that are passed between Socket.IO processes in multi-server deployments. An attacker can execute arbitrary code by sending a crafted pickle payload to a message queue used for inter-server communication.
Note: This is only exploitable if the attacker has already compromised the message queue or if the queue was publicly exposed.
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.