{"id":"BIT-airflow-2026-33264","summary":"Apache Airflow: DAG author RCE on webserver via unrestricted import_string() in BaseSerialization.deserialize()","details":"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.","aliases":["CVE-2026-33264","GHSA-2943-9672-r45w","PYSEC-2026-2082"],"modified":"2026-09-08T08:45:25.808446907Z","published":"2026-07-09T08:41:48.718Z","database_specific":{"cpes":["cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*"],"severity":"Critical"},"references":[{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2026/07/07/1"},{"type":"FIX","url":"https://github.com/apache/airflow/pull/66002"},{"type":"FIX","url":"https://github.com/apache/airflow/pull/68528"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltj"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33264"}],"affected":[{"package":{"name":"airflow","ecosystem":"Bitnami","purl":"pkg:bitnami/airflow"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.3.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/airflow/BIT-airflow-2026-33264.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}],"schema_version":"1.9.0"}