Vulnerability Description
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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Airflow | < 3.3.0 |
Related Weaknesses (CWE)
References
- https://github.com/apache/airflow/pull/66002Issue TrackingPatch
- https://github.com/apache/airflow/pull/68528Issue TrackingPatch
- https://lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltjVendor AdvisoryMailing List
- http://www.openwall.com/lists/oss-security/2026/07/07/1Third Party AdvisoryMailing List
FAQ
What is CVE-2026-33264?
CVE-2026-33264 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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...
How severe is CVE-2026-33264?
CVE-2026-33264 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-33264?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Airflow.