CVE-2026-111421
Published:November 09, 2026
Updated:November 09, 2026
Apache Airflow's Task Execution API stored XCom values written by a task without the reserved-key check applied elsewhere, so a Dag author's task could write an XCom that, when a user later viewed it through the API with deserialization enabled, made the API server instantiate classes from the "airflow.*" namespace with arguments the Dag author chose. This is an incomplete fix for CVE-2026-59242: users who applied that fix in apache-airflow 3.3.1 remain affected through this route and should upgrade to apache-airflow 3.4.0 or later.
Affected Packages
apache-airflow-core (CONDA):
Affected version(s) >=3.0.0 <3.4.0Fix Suggestion:
Update to version 3.4.0https://github.com/apache/airflow.git (GITHUB):
Affected version(s) >=3.0.0a1 <3.4.0 || =3.4.0b1 <3.4.0Fix Suggestion:
Update to version 3.4.0apache-airflow-core (PYTHON):
Affected version(s) >=3.0.0rc1 <3.4.0 || =3.4.0b1 <3.4.0Fix Suggestion:
Update to version 3.4.0apache-airflow (PYTHON):
Affected version(s) =3.0.0b4 <3.4.0Fix Suggestion:
Update to version 3.4.0Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Deserialization of Untrusted Data