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OpenAdvisories
High · 8.8 CVE-2026-33858 BIT-airflow-2026-33858EUVD-2026-21978GHSA-mc4f-r875-v87wPYSEC-2026-20

Apache Airflow: Unsafe Deserialization via Legacy Serialization Keys (__type/__var) Bypass in XCom API

Published Apr 13, 2026 · Updated Nov 3, 2026 · Assigned by apache

Description

Dag Authors, who normally should not be able to execute code in the webserver context could craft XCom payload causing the webserver to execute arbitrary code. Since Dag Authors are already highly trusted, severity of this issue is Low.

Users are recommended to upgrade to Apache Airflow 3.2.0, which resolves this issue.

Affected products

VendorProductAffectedFixed
Apache Software Foundation Apache Airflow 3.1.8 – < 3.2.0 3.2.0

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI apache-airflow >= 3.1.8, < 3.2.0 3.2.0 GHSA-mc4f-r875-v87w

Advisories 1

References