GHSA-mc4f-r875-v87w
Apache Airflow: Unsafe Deserialization via Legacy Serialization Keys (__type/__var) Bypass in XCom API
At a glance
- Published
- Updated
- CVE
- CVE-2026-33858
- Aliases
- BIT-airflow-2026-33858, PYSEC-2026-20
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 packages
| Package | Versions |
|---|---|
| PyPI · apache-airflow | introduced 3.1.8, fixed 3.2.0 |
References
- 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
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |