CVE-2026-86843: Apache Airflow Teradata provider: SQL injection via unvalidated Dag Params in the compute-cluster example Dag

[Shahar Epstein <shahar () apache org>]

Severity: low 

Affected versions:

- Apache Airflow Teradata provider before 3.7.0

Description:

The Apache Airflow Teradata provider's compute-cluster example Dag declared every one of its Dag Params as 
unconstrained free text and templated them straight into the compute-cluster operators, which interpolate those values 
into Teradata DDL. A user who is permitted to trigger that Dag - a lower-trust role than the Dag author, and one that 
needs no Teradata credentials of its own - could therefore supply SQL fragments that execute under the connection the 
task runs as, and could additionally redirect the task at any other connection defined in the deployment, because the 
connection id was itself a free-text Param. Only deployments that run this example Dag, or a Dag copied from it, are 
affected; the provider's operator code is unchanged. Users of apache-airflow-providers-teradata are recommended to 
upgrade to version 3.7.0 or later, whose example constrains the Params to validated identifiers and a closed value set 
and removes connection selection and free-form option strings from trigger-time input. Upgrading does not change a Dag 
already copied from the example; users who copied it should apply the same constraints to their copy.

Credit:

Andrew Rukin (Arenadata) (finder)
Jarek Potiuk (remediation developer)

References:

https://github.com/apache/airflow/pull/72714
https://airflow.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-86843