PT-2026-45977 · Pypi · Apache Airflow

Published 2026-06-01 · Updated 2026-06-01

OSV

CVSS v3.1

7.3

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Apache Airflow's scheduler-side deadline-reference decoder (SerializedCustomReference.deserialize reference) imported and dispatched arbitrary class paths drawn from DAG-author-controlled serialized state without an allowlist or plugin-registry gate. A DAG author whose code reaches the scheduler — the default on single-host deployments where the DAG bundle is importable from the scheduler process — could embed a custom DeadlineReference whose serialized form named an attacker-controlled module path, causing the scheduler to import string(...) and instantiate that class with a live SQLAlchemy session attached. Affects deployments where DAG-author code is less trusted than the scheduler process. Users are advised to upgrade to apache-airflow 3.2.2 or later.

Fix

Related Identifiers

PYSEC-2026-186

Affected Products

Apache Airflow

References · 4

• https://osv.dev/vulnerability/PYSEC-2026-186 · Vendor Advisory
• https://github.com/apache/airflow/pull/66737 · Note
• https://lists.apache.org/thread/q227dghjwgfz8xsxrf2pwpz4wk43zm83 · Note
• http://openwall.com/lists/oss-security/2026/05/31/12 · Note