{"id":"GHSA-q4c3-7575-55j2","summary":"Apache Airflow scheduler unsafely deserializes human-in-the-loop task next_kwargs","details":"Apache Airflow 3.3.0 moved human-in-the-loop tasks from the triggerer to a new `awaiting_input` task state swept by the scheduler. That sweep deserializes the task instance's `next_kwargs` without an allow-list, so a Dag author — who controls that value through the task execution API — can cause an arbitrary module import and object instantiation inside the scheduler process, or terminate the scheduler job. No non-default configuration is required: the sweep runs unconditionally every 15 seconds, and the default `allowed_deserialization_classes` setting does not cover this code path. Versions before 3.3.0 are not affected, because human-in-the-loop tasks deferred onto the triggerer instead. This is a different code path from CVE-2026-58076, which covers the same unguarded exception-node deserialization reached elsewhere — deployments that applied that fix must upgrade for this issue as well. Users are advised to upgrade to apache-airflow 3.3.1 or later.","aliases":["BIT-airflow-2026-67260","CVE-2026-67260","PYSEC-2026-3707"],"modified":"2026-10-02T23:41:04.597715151Z","published":"2026-08-12T18:31:18Z","database_specific":{"cwe_ids":["CWE-502"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-10-02T23:15:49Z","nvd_published_at":"2026-08-12T16:17:14Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67260"},{"type":"WEB","url":"https://github.com/apache/airflow/pull/70685"},{"type":"WEB","url":"https://github.com/apache/airflow/commit/18b622920cf0f486155075125ecdcabc752b1eca"},{"type":"WEB","url":"https://github.com/apache/airflow/commit/a1ab0653121829675ad864080d2cd9d3d1688b01"},{"type":"PACKAGE","url":"https://github.com/apache/airflow"},{"type":"WEB","url":"https://github.com/apache/airflow/releases/tag/3.3.1"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2026-3707.yaml"},{"type":"WEB","url":"https://lists.apache.org/thread/vygr0fh82cjzjp5k4vtfmboxryvm3lyn"},{"type":"WEB","url":"https://www.cve.org/CVERecord?id=CVE-2026-58076"}],"affected":[{"package":{"name":"apache-airflow","ecosystem":"PyPI","purl":"pkg:pypi/apache-airflow"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.3.0"},{"fixed":"3.3.1"}]}],"versions":["3.3.0","3.3.1rc1","3.3.1rc2"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-q4c3-7575-55j2/GHSA-q4c3-7575-55j2.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"}]}