CVE-2026-42359

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Source

https://cve.org/CVERecord?id=CVE-2026-42359

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42359.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-42359

Aliases

Published

2026-06-01T07:49:17.429Z

Modified

2026-07-09T21:26:23.223875006Z

Severity

8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator

Summary

Apache Airflow: Authenticated RCE via XCom PATCH endpoint — XComUpdateBody missing FORBIDDEN_XCOM_KEYS validator

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.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42359.json",
    "cna_assigner": "apache",
    "cwe_ids": [
        "CWE-502"
    ]
}

References

Affected packages

Git / github.com/apache/airflow

Affected ranges

Type

GIT

Repo

https://github.com/apache/airflow

Events

Introduced

37069948c093e4b6720ec4821ff0ed7d6c069935

Fixed

21cbbf663b140f4a84cf123acb90328a6a4d30f5

Database specific

{
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ],
    "cpe": "cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "3.2.0"
        },
        {
            "fixed": "3.2.2"
        }
    ]
}

Affected versions

3.*

3.2.1

3.2.1rc1

3.2.1rc2

3.2.1rc3

3.2.2

3.2.2rc1

3.2.2rc2

3.2.2rc3

python-client/3.*

python-client/3.2.0

python-client/3.2.0rc1

python-client/3.2.1

python-client/3.2.1rc1

task-sdk/1.*

task-sdk/1.2.1

task-sdk/1.2.1rc1

task-sdk/1.2.1rc2

task-sdk/1.2.1rc3

task-sdk/1.2.2

task-sdk/1.2.2rc1

task-sdk/1.2.2rc2

task-sdk/1.2.2rc3

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42359.json"