{"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 \u2014 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"}}]}}