CVE-2026-25917: Apache Airflow: API extra-links triggers XCom deserialization/class instantiation (Airflow 3.1.5)

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-18 · updated 2026-10-26
Weakness: CWE-502

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 fixes the issue.

Affected products

Apache Airflow: before 3.2.0 — fixed in 3.2.0

How to fix

Upgrade to a fixed version: Apache Airflow 3.2.0. Check the vendor advisory for mitigations.

References

https://github.com/apache/airflow/pull/61641
https://lists.apache.org/thread/6whgpkqbh12rvpfmvcg8b0vwlv4hq3po
http://www.openwall.com/lists/oss-security/2026/04/17/9

Get alerted when CVE-2026-25917 or the next vulnerability affects your stack