Deserialization of Untrusted Data in Apache Airflow - CVE-2026-67587
Published: August 24, 2026
Vulnerability identifier: #VU144877
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-67587
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to unsafe deserialization in the Task SDK `Callback` object reconstruction path when deserializing serialized callback data during the scheduler's awaiting_input timeout sweep. A remote user can control a task instance's `next_kwargs` through the task execution API to execute arbitrary code.
No non-default configuration is required, and the vulnerable code path is reached unconditionally by the scheduler sweep.
Affected software
Apache Airflow
How to mitigate CVE-2026-67587
Install security update from vendor's website.
Apache Airflow - update to 3.3.1