[<prev] [next>] [day] [month] [year] [list]
Message-ID: <03fd03d6-285c-de38-caf0-eb23a82c553c@apache.org>
Date: Wed, 12 Aug 2026 13:26:17 +0000
From: Rahul Vats <rahulvats@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-59242: Apache Airflow: Arbitrary airflow.* class
instantiation on the API server via the XCom deserialize endpoint
Severity: important
Affected versions:
- Apache Airflow (apache-airflow) before 3.3.1
Description:
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.
Credit:
localhost-detect (@localhost-detect) (finder)
Jarek Potiuk (remediation developer)
References:
https://github.com/apache/airflow/pull/69378
https://airflow.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-59242
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
