Apache Airflow: Authenticated RCE via XCom PATCH endpoint — XComUpdateBody missing FORBIDDEN_XCOM_KEYS validator
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Apache Software Foundation | Apache Airflow | unaffected |
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| Apache | Airflow |
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| Source | ID | Title |
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Github GHSA |
GHSA-wr76-29cr-67w8 | Apache Airflow has a Deserialization of Untrusted Data vulnerability |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.571% probability within 30 days)
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| CPEs | cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:* |
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| Metrics |
cvssV3_1
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| First Time appeared |
Apache
Apache airflow |
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| Vendors & Products |
Apache
Apache airflow |
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| Description | 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. | |
| Title | Apache Airflow: Authenticated RCE via XCom PATCH endpoint — XComUpdateBody missing FORBIDDEN_XCOM_KEYS validator | |
| Weaknesses | CWE-502 | |
| References |
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