CVE-2026-86829
HIGH 1 PoC
MEDIUM
Priority: 0.06
BB Relevance:
78/100
Published: 2026-11-09
Modified: 2026-11-12
First seen: 2026-11-09
Status: active
Attack Surface
Network
Low Complexity
No Interaction
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
High
I:
High
A:
High
Description
Apache Airflow's scheduler fully deserializes XCom values written by task code while evaluating task dependencies. A Dag author, who controls what a task writes to XCom, therefore controls data that is deserialized inside the scheduler process - a context the Airflow security model reserves for code installed by the Deployment Manager, above the worker-scoped execution capability a Dag author is documented to have. Deployments that treat Dag authors as less trusted than Deployment Managers are affected, and the scheduler must be evaluating a task dependency that reads a task-written XCom value. Users of apache-airflow are recommended to upgrade to version 3.4.0 or later, which restricts dependency evaluation to primitive XCom values.
Weakness Classification (1)
Affected Software (3)
| Vendor | Product | Version |
|---|---|---|
| Apache Software Foundation | Apache Airflow | 0 < 3.4.0 |
| Apache Software Foundation | Apache Airflow | 0 < 3.4.0 |
| Apache Software Foundation | Apache Airflow | 0 < 3.4.0 |
References & Advisories (3)
vendor-advisory
patch