CVE-2026-86829
Apache Airflow: Deserialization of task-controlled XCom values in the Scheduler during dependency evaluation
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.
INFO
Published Date :
Nov. 9, 2026, 10:17 a.m.
Last Modified :
Nov. 9, 2026, 11:17 a.m.
Remotely Exploit :
No
Source :
[email protected]
Solution
- Upgrade Apache Airflow to version 3.4.0 or later.
- Restrict dependency evaluation to primitive XCom values.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-86829.
| URL | Resource |
|---|---|
| https://github.com/apache/airflow/pull/72718 | |
| https://lists.apache.org/thread.html/2qbt7qnclrlxtg3f1b685533r3mvk9hv | |
| http://www.openwall.com/lists/oss-security/2026/11/09/9 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-86829 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-86829
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-86829 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-86829 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 09, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/11/09/9 -
New CVE Received by [email protected]
Nov. 09, 2026
Action Type Old Value New Value Added 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. Added CWE CWE-502 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/86xxx/CVE-2026-86829.json">CVE-2026-86829</a> Added Reference https://github.com/apache/airflow/pull/72718 Added Reference https://lists.apache.org/thread.html/2qbt7qnclrlxtg3f1b685533r3mvk9hv