CVE-2026-111421 (GCVE-0-2026-111421)

Vulnerability from cvelistv5 – Published: 2026-11-09 09:15 – Updated: 2026-11-09 15:10
VLAI
Title
Apache Airflow: Execution API: set_xcom skips the reserved-key check, so task-written XComs instantiate airflow.* classes on the API server
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.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 15:09 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
apache CNA
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache Airflow Affected: 3.0.0 , < 3.4.0 (semver)
Create a notification for this product.
Credits
Qi Qin of depthfirst Hama1cco Zhixi "Jace" Sun, independent security researcher Michael Lip (theluckystrike) Jarek Potiuk
Show details on NVD website
To clipboard 

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