Deserialization of Untrusted Data Affecting nemo-toolkit package, versions [,2.6.2)
Threat Intelligence
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- published6 Apr 2026
- disclosed24 Mar 2026
- creditDan Aridor
Introduced: 24 Mar 2026
CVE-2026-24159 (opens in a new tab)How to fix?
Upgrade nemo-toolkit to version 2.6.2 or higher.
Overview
nemo-toolkit is a NeMo - a toolkit for Conversational AI
Affected versions of this package are vulnerable to Deserialization of Untrusted Data the HFCheckpointIO checkpoint-loading process in nemo/lightning/io/hf.py. An attacker can execute arbitrary code on the victim system by supplying a crafted checkpoint that is loaded during model restoration. The issue affects consumers who load untrusted checkpoint files from local paths or from HuggingFace Hub-backed model artifacts, where deserializing trainer.pt can trigger code execution during checkpoint import.
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.