Deserialization of Untrusted Data in Apache Airflow - CVE-2026-59242
Published: August 24, 2026
Vulnerability identifier: #VU144874
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-59242
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to instantiate arbitrary airflow.* classes on the API server.
The vulnerability exists due to deserialization of untrusted data in the XCom deserialize endpoint when reading an XCom entry with deserialize=true. A remote user can write an XCom value and then read it back to instantiate arbitrary airflow.* classes on the API server.
Exploitation requires XCom write-and-read access through the API.
Affected software
Apache Airflow
How to mitigate CVE-2026-59242
Install security update from vendor's website.
Apache Airflow - update to 3.3.1