CVE-2026-59242Apache Airflow: Arbitrary airflow.* class instantiation on the API server via the XCom deserialize endpoint

Descripción

Apache Airflow's XCom `GET /api/v2/{...}/xcomEntries/{key}?deserialize=true` endpoint passed a string-literal payload through `BaseXCom.deserialize_value` without the `_check_forbidden_xcom_keys` guard, allowing an authenticated API user with XCom write-and-read access to instantiate arbitrary `airflow.*` classes on the API server (CWE-502). An authenticated user who can write an XCom value and then read it back with `deserialize=true` triggers the unsafe instantiation. Users are advised to upgrade to apache-airflow 3.3.1 or later, which rejects reserved XCom serialization keys submitted as JSON string literals.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/apache/airflow/pull/69378 patchIssue TrackingPatch
• https://lists.apache.org/thread/dm0520yhh4mn7qknyoh45r2w6c5qg2mg vendor-advisoryMailing ListVendor Advisory
• http://www.openwall.com/lists/oss-security/2026/08/12/6 Mailing ListThird Party Advisory