CVE-2026-33858

HIGH

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

Title source: cna
STIX 2.1

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.

References (3)

Core 3

Scores

CVSS v3 8.8
EPSS 0.0056
EPSS Percentile 42.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-502
Status published
Products (3)
apache/airflow 3.1.8 - 3.2.0
Apache Software Foundation/Apache Airflow 3.1.8 - 3.2.0
pypi/apache-airflow 3.1.8 - 3.2.0PyPI
Published Apr 13, 2026
Tracked Since Apr 13, 2026