{"id":"CVE-2026-33264","published":"2026-07-07T09:20:18Z","modified":"2026-07-08T03:56:40Z","title":"Apache Airflow: DAG author RCE on webserver via unrestricted import_string() in BaseSerialization.deserialize()","vendor":"Apache","product":"Apache Airflow","tier":"tail","description":{"text":"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.","provenance":"source","from":"CVE.org"},"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.01649,"percentile":0.76405,"provenance":"source"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"references":[{"url":"https://github.com/apache/airflow/pull/66002","tags":["patch"]},{"url":"https://github.com/apache/airflow/pull/68528","tags":["patch"]},{"url":"https://lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltj","tags":["vendor-advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2026/07/07/1","tags":[]}],"priority":{"score":22.1,"factors":[{"name":"EPSS percentile","points":15.28},{"name":"CVSS severity","points":6.86}]},"vendorSlug":"apache","affectedVersions":[{"vendor":"Apache Software Foundation","product":"Apache Airflow","versions":["< 3.3.0"]}],"affected":[{"ecosystem":"PyPI","package":"apache-airflow","vulnerableRanges":["<3.3.0"],"patched":["3.3.0"],"from":["GHSA-2943-9672-r45w","PYSEC-2026-2082"],"provenance":"source"}],"euvd":{"id":"EUVD-2026-42030","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-apache-airflow-cve-2026-33264","children":[{"from":"CVE-2026-33264","to":"CVE-2026-58076","relation":"related","confidence":"high","kind":"lineage","evidence":[{"kind":"osv-related","provenance":"source","id":"GHSA-8prw-8m6x-8w6f","via":"reference","url":"https://www.cve.org/CVERecord?id=CVE-2026-33264"},{"kind":"osv-related","provenance":"source","id":"PYSEC-2026-3991","via":"reference","url":"https://www.cve.org/CVERecord?id=CVE-2026-33264"}]}]}}