CVE-2026-33858

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

CVSS 8.8 HIGHEPSS 0.6%CWE-502

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.8EPSS 0.6%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

13 Apr 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Apache Software Foundation · Apache Airflow

References

https://github.com/apache/airflow/pull/64148 https://lists.apache.org/thread/1npt3o2x81s0gw9tmfcv4n7p1z9hdmy0 http://www.openwall.com/lists/oss-security/2026/04/13/7

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

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