CVE-2026-33858

CVE-2026-33858: Apache Airflow: Unsafe Deserialization via Legacy Serialization Keys (__type/__var) Bypass in XCom API

Vendor Apache Software Foundation
Product Apache Airflow
Weakness CWE-502 · Unsafe deserialization
Published April 13, 2026
Last update April 14, 2026
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CVSS base score

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What the vulnerability does

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.

Key dates

Disclosure timeline

April 13, 2026 CVE published
April 14, 2026 Record updated