PT-2026-56175 · Apache · Apache Airflow

Amogh Desai + 4 · Published 2026-07-07 · Updated 2026-07-07 · CVE-2026-33264

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions apache-airflow versions prior to 3.3.0

Description A bug in the BaseSerialization.deserialize() function allows unrestricted import string() of attacker-controlled class paths when the Scheduler or API Server loads a serialized DAG. A DAG author can embed a malicious trigger into a DAG to achieve remote code execution on the API Server or Scheduler process, bypassing the security boundary that prevents DAG-author code from executing within those processes.

Recommendations Upgrade to apache-airflow version 3.3.0 or later. Restrict the [core] allowed deserialization classes configuration to a narrow allowlist in deployments where trust in DAG authors is limited.

Fix

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2026-33264

Affected Products

Apache Airflow

References · 7

• https://github.com/apache/airflow/pull/68528 · Patch
• https://github.com/apache/airflow/pull/66002 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-33264 · Security Note
• https://lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltj · Vendor Advisory
• https://twitter.com/CVEnew/status/2074459516280709202 · Twitter Post
• http://openwall.com/lists/oss-security/2026/07/07/1 · Note
• https://twitter.com/infoflowcloud/status/2074460005982416911 · Twitter Post