CVE-2026-33264

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

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

1.6% chance of exploitation in the next 30 days; higher than 76% of CVEs (scores of 2026-10-25)

CWE

CWE-502

Published

2026-07-07

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

Affected

• apache:airflow

Packages (OSV)

References

• https://github.com/apache/airflow/pull/66002
• https://github.com/apache/airflow/pull/68528
• https://lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltj
• http://www.openwall.com/lists/oss-security/2026/07/07/1

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