PYSEC-2026-185

Vulnerability from pysec - Published: 2026-06-01 09:16 - Updated: 2026-06-03 10:54
VLAI
Details

A bug in Apache Airflow's XCom PATCH endpoint PATCH /api/v2/xcomEntries/{key} allowed an authenticated UI/API user with XCom write permission on a Dag to set XCom entries under reserved key names (e.g. return_value) that the matching POST endpoint already validated against FORBIDDEN_XCOM_KEYS. The endpoint also accepted serialized payload shapes the triggerer's deserializer treats as code; combined, this allowed RCE on the triggerer when the affected task next deferred. Affects deployments where untrusted users have XCom write permission on Dags that defer to the triggerer. This is a fix-bypass of CVE-2026-33858: PR #64148 added the FORBIDDEN_XCOM_KEYS validator only on the POST/set path; the PATCH path was not covered. Users who already upgraded for CVE-2026-33858 should additionally upgrade to apache-airflow 3.2.2 or later to cover the PATCH-path bypass.

Impacted products
Name purl
apache-airflow pkg:pypi/apache-airflow
Aliases

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "apache-airflow",
        "purl": "pkg:pypi/apache-airflow"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.2.0"
            },
            {
              "fixed": "3.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.0",
        "3.2.1",
        "3.2.1rc1",
        "3.2.1rc2",
        "3.2.1rc3",
        "3.2.2rc1",
        "3.2.2rc2",
        "3.2.2rc3"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42359"
  ],
  "details": "A bug in Apache Airflow\u0027s XCom PATCH endpoint `PATCH /api/v2/xcomEntries/{key}` allowed an authenticated UI/API user with XCom write permission on a Dag to set XCom entries under reserved key names (e.g. `return_value`) that the matching POST endpoint already validated against `FORBIDDEN_XCOM_KEYS`. The endpoint also accepted serialized payload shapes the triggerer\u0027s deserializer treats as code; combined, this allowed RCE on the triggerer when the affected task next deferred. Affects deployments where untrusted users have XCom write permission on Dags that defer to the triggerer. This is a fix-bypass of CVE-2026-33858: PR #64148 added the `FORBIDDEN_XCOM_KEYS` validator only on the POST/set path; the PATCH path was not covered. Users who already upgraded for CVE-2026-33858 should additionally upgrade to `apache-airflow` 3.2.2 or later to cover the PATCH-path bypass.",
  "id": "PYSEC-2026-185",
  "modified": "2026-06-03T10:54:36.415081Z",
  "published": "2026-06-01T09:16:18.907Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://lists.apache.org/thread/g8dqykpf1p90tysq8tln4qtkqwb1038s"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-33858"
    },
    {
      "type": "FIX",
      "url": "https://github.com/apache/airflow/pull/65915"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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