{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-42359",
        "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "state": "PUBLISHED",
        "assignerShortName": "apache",
        "dateReserved": "2026-04-26T19:37:56.165Z",
        "datePublished": "2026-06-01T07:49:17.429Z",
        "dateUpdated": "2026-06-02T13:03:40.834Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "collectionURL": "https://pypi.python.org",
                    "defaultStatus": "unaffected",
                    "packageName": "apache-airflow",
                    "product": "Apache Airflow",
                    "vendor": "Apache Software Foundation",
                    "versions": [
                        {
                            "lessThan": "3.2.2",
                            "status": "affected",
                            "version": "3.2.0",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "Jeff Vier (@boinger)"
                },
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "Anisto Mejin (Izat)"
                },
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "Venkatraman Kumar (r3dw0lfsec), Securin"
                },
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "Jarek Potiuk"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "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."
                        }
                    ],
                    "value": "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."
                }
            ],
            "metrics": [
                {
                    "other": {
                        "content": {
                            "text": "medium"
                        },
                        "type": "Textual description of severity"
                    }
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-502",
                            "description": "CWE-502: Deserialization of Untrusted Data",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
                "shortName": "apache",
                "dateUpdated": "2026-06-01T15:16:19.161Z"
            },
            "references": [
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/apache/airflow/pull/65915"
                },
                {
                    "tags": [
                        "vendor-advisory"
                    ],
                    "url": "https://lists.apache.org/thread/g8dqykpf1p90tysq8tln4qtkqwb1038s"
                },
                {
                    "tags": [
                        "related"
                    ],
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-33858"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "title": "Apache Airflow: Authenticated RCE via XCom PATCH endpoint — XComUpdateBody missing FORBIDDEN_XCOM_KEYS validator",
            "x_generator": {
                "engine": "airflow-s/generate_cve_json.py"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 8.8,
                            "attackVector": "NETWORK",
                            "baseSeverity": "HIGH",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                            "integrityImpact": "HIGH",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "HIGH",
                            "privilegesRequired": "LOW",
                            "confidentialityImpact": "HIGH"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-06-02T03:55:43.691388Z",
                                "id": "CVE-2026-42359",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-06-02T13:03:40.834Z"
                }
            }
        ]
    }
}