high · CVSS v3 8.8

CVE-2026-111421

Apache Airflow's Task Execution API stored XCom values written by a task without the reserved-key check applied elsewher…

Description

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.

Scores

Severity
high
CVSS v2
5.5
CVSS v3
8.8
CVSS v4
—
EPSS
—

← All CVEs