CVE-2026-59242

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.

CVSS v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/apache/airflow/pull/69378	Issue Tracking Patch
https://lists.apache.org/thread/dm0520yhh4mn7qknyoh45r2w6c5qg2mg	Mailing List Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/08/12/6	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*

History

23 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) El endpoint XCom de Apache Airflow “’GET /api/v2/{...}/xcomEntries/{key}?deserialize=true’” pasó una carga útil de cadena literal a través de “’BaseXCom.deserialize_value’” sin la protección “’_check_forbidden_xcom_keys’”, permitiendo a un usuario autenticado de la API con acceso de escritura y lectura de XCom instanciar clases “’airflow.*’” arbitrarias en el servidor de la API (CWE-502). Un usuario autenticado que puede escribir un valor XCom y luego leerlo de nuevo con “’deserialize=true’” desencadena la instanciación insegura. Se aconseja a los usuarios actualizar a apache-airflow 3.3.1 o posterior, que rechaza las claves de serialización XCom reservadas enviadas como cadenas literales JSON.

Information

Published : 2026-08-12 16:17

Updated : 2026-10-24 16:10

NVD link : CVE-2026-59242

Mitre link : CVE-2026-59242

CVE.ORG link : CVE-2026-59242

JSON object : View

Products Affected

apache

airflow

CWE

CWE-502

Deserialization of Untrusted Data

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