{"cve":"CVE-2026-33264","nvd":{"published":"2026-07-07T10:16:40.443","modified":"2026-10-25T20:10:00.147","status":"Analyzed","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-502"],"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"],"products":["apache:airflow"],"source":"nvd","synced_at":"2026-10-25T23:44:34.550481224+00:00"},"epss":{"cve":"CVE-2026-33264","score":0.01649,"percentile":0.76321,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-2943-9672-r45w","url":"https://osv.dev/vulnerability/GHSA-2943-9672-r45w","summary":"Apache Airflow allows code execution through unsafe serialized DAG deserialization","modified":"2026-09-04T19:40:19.933602916Z","packages":[{"ecosystem":"PyPI","name":"apache-airflow","purl":"pkg:pypi/apache-airflow","ranges":["<3.3.0"],"fixed":["3.3.0"]}]},{"id":"PYSEC-2026-2082","url":"https://osv.dev/vulnerability/PYSEC-2026-2082","summary":"","modified":"2026-09-10T11:15:09.025887119Z","packages":[{"ecosystem":"PyPI","name":"apache-airflow","purl":"pkg:pypi/apache-airflow","ranges":["<3.3.0"],"fixed":["3.3.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}