{"id":"BIT-airflow-2026-59242","summary":"Apache Airflow: Arbitrary airflow.* class instantiation on the API server via the XCom deserialize endpoint","details":"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.","aliases":["CVE-2026-59242"],"modified":"2026-09-08T08:45:29.103615458Z","published":"2026-08-17T05:39:24.207Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2026/08/12/6"},{"type":"FIX","url":"https://github.com/apache/airflow/pull/69378"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/dm0520yhh4mn7qknyoh45r2w6c5qg2mg"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59242"}],"affected":[{"package":{"name":"airflow","ecosystem":"Bitnami","purl":"pkg:bitnami/airflow"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.3.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/airflow/BIT-airflow-2026-59242.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"}]}],"schema_version":"1.9.0"}