Deserialization of Untrusted Data Affecting apache-airflow-core package, versions [3.2.0,3.4.0)
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-APACHEAIRFLOWCORE-22391747
- published10 Nov 2026
- disclosed9 Nov 2026
- creditJarek Potiuk
Introduced: 9 Nov 2026
NewCVE-2026-111395 (opens in a new tab)How to fix?
Upgrade apache-airflow-core to version 3.4.0 or higher.
Overview
Affected versions of this package are vulnerable to Deserialization of Untrusted Data via the DAG run conf field, which did not reject reserved serialization keys (such as __classname__ or __type__). A user permitted to trigger a DAG that uses a deadline alert with an asynchronous callback can pass a conf containing these reserved keys, which, once the deadline is missed, either crashes the scheduler repeatedly or causes the Triggerer to reconstruct arbitrary objects from the malicious conf data.
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.