CVE-2026-67587: Apache Airflow Task SDK Callback Deserialization Vulnerability
Summary
CVE-2026-67587: Apache Airflow Task SDK Callback deserialization can import arbitrary modules in the scheduler. Affects apache-airflow versions >= 3.3.0, < 3.3.1. Fixed in 3.3.1. How to fix ↓
Also tracked for
- airflow · Bitnami
The same CVE-2026-67587 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
Apache Airflow is an open-source platform designed to programmatically author, schedule, and monitor workflows. It allows users to define workflows as directed acyclic graphs (DAGs) of tasks. The Task SDK provides a way to create tasks and manage their execution. However, a vulnerability exists in the way the Task SDK handles deserialization of callback objects, potentially allowing unauthorized module imports.
Vulnerability Detail
The vulnerability arises from Apache Airflow's Task SDK, which reconstructs a Callback object from serialized data by re-executing its constructor. This process imports the module specified by the stored callback path. Since SyncCallback is an Airflow class, it adheres to the default allow-list for deserialization classes, making it difficult to restrict. A malicious Dag author can exploit this by manipulating a task instance's next_kwargs, leading to arbitrary module imports during the scheduler's deserialization process. This vulnerability affects versions prior to 3.3.1, with a CVSS score of 8.8, indicating a high severity risk.
How To Fix
Latest published version: 3.3.2 as of 22 Oct 2026
pip install --upgrade "apache-airflow==3.3.2"Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
3.3.1
This is the first release that contains the fix.
pip install --upgrade "apache-airflow==3.3.1"Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There are no specific workarounds mentioned for this vulnerability. The best course of action is to upgrade to the latest version of Apache Airflow.
Conclusion
In summary, CVE-2026-67587 is a significant vulnerability in Apache Airflow that allows for arbitrary module imports through deserialization of callback objects. Users are strongly encouraged to upgrade to version 3.3.1 or later to mitigate this risk. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
See every vulnerability recorded for apache-airflow →
FAQ
CVE-2026-67587 is a vulnerability in Apache Airflow's Task SDK that allows for arbitrary module imports through deserialization of callback objects.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Versions of Apache Airflow prior to 3.3.1 are affected by this vulnerability.
While there are no specific workarounds, it is advisable to prioritize upgrading to the patched version as soon as possible to mitigate the risk.
The CVSS score of this vulnerability is 8.8, indicating a high severity risk.
References
Related vulnerabilities
Recent vulnerabilities recorded for apache-airflow.
