CVE-2026-41018: Apache Airflow Providers Elasticsearch: Elasticsearch task-log handlers leak credentials embedded in the host URL

[Shahar Epstein <shahar () apache org>]

Severity: low 

Affected versions:

- Apache Airflow Providers Elasticsearch (apache-airflow-providers-elasticsearch) before 6.5.3

Description:

The Elasticsearch logging provider, when configured with a `host` URL that embeds credentials (for example ` 
https://user:password () server example com:9200` ), wrote the full host URL — including the embedded credentials — 
into task logs. Any user with task-log read permission could harvest the backend credentials. The two providers are 
forks of the same codebase and shared the same bug. Users are advised to upgrade to a fixed version of 
`apache-airflow-providers-elasticsearch` and, as a defense-in-depth measure, configure the backend credentials via a 
secret backend rather than embedding them in the `[elasticsearch]` URL.

Credit:

Aleksandr Sozinov (finder)
Jarek Potiuk (remediation developer)

References:

https://github.com/apache/airflow/pull/65349
https://github.com/apache/airflow/pull/65509
https://airflow.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-41018