CVE-2026-33264: critical vulnerability in Apache Airflow
Apache Airflow: DAG author RCE on webserver via unrestricted import_string() in BaseSerialization.deserialize()
Published · Updated
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.8epss 1.6%
A bug in `BaseSerialization.deserialize()` allowed unrestricted `import_string()` of attacker-controlled class paths when the Scheduler / API Server loaded a serialized DAG: a DAG author could embed a malicious trigger into a DAG to gain remote code execution on the API Server / Scheduler process, crossing the Airflow security boundary that DAG-author code must never execute in those processes. Users are advised to upgrade to `apache-airflow` 3.3.0 or later. As a defense-in-depth mitigation, deployments where DAG-author trust is limited can restrict the `[core] allowed_deserialization_classes` config to a narrow allowlist.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Apache Software Foundation · Apache AirflowRelated CVEs — Apache Airflow
In the same product, most dangerous first.
CVE-2020-11978HIGHCVE-2020-11978EPSS 99.2%KEVCVE-2022-40127HIGHApache Airflow <2.4.0 has an RCE in a bash exampleEPSS 85.7%CVE-2022-45402MEDIUMApache Airflow: Open redirect during loginEPSS 81.1%CVE-2021-38540—Apache Airflow: Variable Import endpoint missed authentication checkEPSS 80.9%CVE-2022-24288—Apache Airflow: RCE in example DAGsEPSS 78.4%CVE-2020-11981—CVE-2020-11981EPSS 36.8%