CVE-2026-33264
Apache Airflow: DAG author RCE on webserver via unrestricted import_string() in BaseSerialization.deserialize()
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.
INFO
Published Date :
July 7, 2026, 10:16 a.m.
Last Modified :
July 7, 2026, 10:16 a.m.
Remotely Exploit :
No
Source :
[email protected]
Solution
- Upgrade apache-airflow to version 3.3.0 or later.
- Consider restricting deserialization classes via configuration.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33264.
| URL | Resource |
|---|---|
| https://github.com/apache/airflow/pull/66002 | |
| https://github.com/apache/airflow/pull/68528 | |
| https://lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltj |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33264 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33264
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33264 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-33264 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Jul. 07, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Apache Software Foundation', 'product': 'Apache Airflow', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '3.3.0', 'versionType': 'semver'}], 'packageName': 'apache-airflow', 'collectionURL': 'https://pypi.python.org', 'defaultStatus': 'unaffected'}] Added 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. Added CWE CWE-502 Added Reference https://github.com/apache/airflow/pull/66002 Added Reference https://github.com/apache/airflow/pull/68528 Added Reference https://lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltj