Apache Airflow: DAG-author remote code execution on the Scheduler via a Serde `Callback` deserialization gadget

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-67587
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-12 16:17:15 UTC
Updated2026-08-12 16:17:15 UTC
DescriptionApache 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.

Risk And Classification

Problem Types: CWE-502 | CWE-502 CWE-502: Deserialization of Untrusted Data

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Airflow affected 3.3.0 3.3.1 semver Not specified

References

ReferenceSourceLinkTags
github.com/apache/airflow/pull/70704 [email protected] github.com
lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0 [email protected] lists.apache.org
www.cve.org/CVERecord [email protected] www.cve.org
www.cve.org/CVERecord [email protected] www.cve.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Nguyen Van Hiep (@hypnguyen1209), MBBank (en)

CNA: Jarek Potiuk (en)

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