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Deserialization of Untrusted Data Affecting airflow-3 package, versions <3.2.2-r0

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.57% (44th percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-AIRFLOW3-17944868
  • published11 Jul 2026
  • disclosed1 Jun 2026
Report a new vulnerability Found a mistake?

Introduced: 1 Jun 2026

CVE-2026-42359  (opens in a new tab)
CWE-502  (opens in a new tab)

How to fix?

Upgrade Minimos:latest airflow-3 to version 3.2.2-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream airflow-3 package and not the airflow-3 package as distributed by Minimos. See How to fix? for Minimos:latest relevant fixed versions and status.

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.