High [CVE-2026-111421] 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 high-severity Apache Software Foundation advisory covers CVE-2026-111421; related products: Apache Airflow.
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Summary
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.
Is CVE-2026-111421 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-111421 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-111421?
Upgrade to a fixed release named by Apache:
- 3.3.1
- 3.4.0
Confirm against the vendor advisory before you patch.
- Apache Airflow 3.0.0 before 3.4.0
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
- 3.3.1
- 3.4.0
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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