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Deserialization of Untrusted Data Affecting airflow-3 package, versions <3.3.1-r0

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.61% (48th percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-AIRFLOW3-20416337
  • published4 Oct 2026
  • disclosed12 Aug 2026
Report a new vulnerability Found a mistake?

Introduced: 12 Aug 2026

CVE-2026-67587  (opens in a new tab)
CWE-502  (opens in a new tab)

How to fix?

Upgrade Minimos:latest airflow-3 to version 3.3.1-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.

Apache Airflow's Task SDK rebuilt a Callback object from serialized data by re-running its constructor, which imports the module named by the stored callback path. Because SyncCallback is itself an Airflow class it passes the default allowed_deserialization_classes allow-list, so tightening that setting does not help. A Dag author — who controls a task instance's next_kwargs through the task execution API — can therefore cause an arbitrary module to be imported inside the scheduler process, when the scheduler's awaiting_input timeout sweep deserializes that value. No non-default configuration is required; the sweep runs unconditionally. Versions before 3.3.0 are not affected: the class existed, but the scheduler sweep that reaches it did not. This is a separate code path from CVE-2026-58076 and CVE-2026-67260, which cover different gadgets reaching deserialization — applying either of those fixes does not address this one. Users are advised to upgrade to apache-airflow 3.3.1 or later.