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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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"version": "3.1"
}
},
{
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"content": {
"id": "CVE-2026-42359",
"options": [
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"Exploitation": "none"
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{
"Automatable": "no"
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{
"Technical Impact": "total"
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"timestamp": "2026-06-02T03:55:43.691388Z",
"version": "2.0.3"
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"shortName": "CISA-ADP"
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"title": "CISA ADP Vulnrichment"
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{
"collectionURL": "https://pypi.python.org",
"defaultStatus": "unaffected",
"packageName": "apache-airflow",
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"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"
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"value": "A bug in Apache Airflow\u0026#x27;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\u0026#x27;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."
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"value": "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."
}
],
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"type": "Textual description of severity"
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}
],
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{
"descriptions": [
{
"cweId": "CWE-502",
"description": "CWE-502: Deserialization of Untrusted Data",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-01T15:16:19.161Z",
"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"shortName": "apache"
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"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": {
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},
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"assignerShortName": "apache",
"cveId": "CVE-2026-42359",
"datePublished": "2026-06-01T07:49:17.429Z",
"dateReserved": "2026-04-26T19:37:56.165Z",
"dateUpdated": "2026-06-02T13:03:40.834Z",
"state": "PUBLISHED"
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