Deserialization in Apache Software Foundation Airflow
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 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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/apache/airflow/pull/72718 (patch)
- github.com/apache/airflow/pull/74829 (patch)
- www.cve.org/CVERecord (related)
- lists.apache.org/thread.html/pwdwx354tv0x3m8wzfhh59r6wyztj2lk (vendor-advisory)
Frequently asked questions
- What is CVE-2026-111421?
- CVE-2026-111421 is a high-severity vulnerability in Apache Software Foundation Airflow, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-11-09.
- How severe is CVE-2026-111421?
- High severity. CVSS v3 base score is 8.8 out of 10.