CVE-2026-25604 Apache Airflow AWS Auth Manager - Host Header Injection Leading to SAML Authentication Bypass

What is CVE-2026-25604?

CVE-2026-25604 is a medium-severity authentication bypass vulnerability in Apache Airflow Providers Amazon, published on 9 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

In AWS Auth manager, the origin of the SAML authentication has been used as provided by the client and not verified against the actual instance URL.  This allowed to gain access to different instances with potentially different access controls by reusing SAML response from other instances.

You should upgrade to 9.22.0 version of provider if you use AWS Auth Manager.

Weakness: CWE-346

Which versions are affected by CVE-2026-25604?

3 open source packages ship an affected version, including apache-airflow-providers-amazon. It affects 1 product.

Products include Apache Apache-Airflow-Providers-Amazon.

How do I fix CVE-2026-25604?

Upgrade apache-airflow-providers-amazon to 9.22.0 or later.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-25604 being exploited?

There is no known exploitation of CVE-2026-25604 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Apache Airflow Providers Amazon

• CVE-2023-25956 Apache Airflow AWS Provider: Arbitrary file read via AWS provider High 7.5
• CVE-2026-68872 Missing authorization in Apache Airflow Amazon provider Medium 6.5
• CVE-2026-42526 Apache Airflow Amazon provider: Prevent unauthorized access to team-scoped secrets in AWS Secrets Manager and SSM Parameter Store backends Medium 5.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLEANSTART-2026-FR48462, ECHO-909d-8f32-2a00, GHSA-rv5f-ccpm-xjj4, MINI-32gr-f528-m85r, MINI-3wqp-6758-c96v, PYSEC-2026-2363.