{"id":"CVE-2026-33264","aliases":["PYSEC-2026-2082","BIT-airflow-2026-33264","GHSA-2943-9672-r45w"],"title":"A bug in `BaseSerialization.deserialize()` allowed unrestricted `import_string()` of attacker-controlled class paths when the Scheduler /…","summary":"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…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"apache-airflow","product":"apache-airflow","ecosystem":"pip","affected":["apache-airflow < 3.3.0"],"patched":["apache-airflow 3.3.0"],"published":"2026-07-07","updated":"2026-09-10","sourceUpdated":"2026-09-10T11:15:09.025887119Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/PYSEC-2026-2082","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/07/07/1"},{"url":"https://lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltj"},{"url":"https://github.com/apache/airflow/pull/66002"},{"url":"https://github.com/apache/airflow/pull/68528"},{"url":"https://github.com/advisories/GHSA-2943-9672-r45w"}],"tags":["osv","pip"],"epss":0.0103,"epssPercentile":0.61708,"ingestedAt":"2026-07-09T18:56:35.391Z","slug":"CVE-2026-33264","body":"## Overview\n\nA 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.\n\n## Affected packages\n\n- `apache-airflow < 3.3.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `apache-airflow 3.3.0`","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}