GHSA-mc4f-r875-v87w

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

Source: GitHub Advisory Database (reviewed) High CVE-2026-33858

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	apache-airflow	>= 3.1.8, < 3.2.0	3.2.0

Details

As written in the advisory (Markdown source, shown as plain text).

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

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2026-33858 advisory
https://github.com/apache/airflow/pull/64148 web
https://github.com/apache/airflow package
https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2026-20.yaml web
https://lists.apache.org/thread/1npt3o2x81s0gw9tmfcv4n7p1z9hdmy0 web
http://www.openwall.com/lists/oss-security/2026/04/13/7 web