What is CVE-2026-33858?

CVE-2026-33858 is a high-severity vulnerability in Apache Airflow, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-04-13.

How severe is CVE-2026-33858?

High severity. CVSS v3 base score is 8.8 out of 10.

Deserialization in Apache Airflow

CVE-2026-33858

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. …

Vulnerability class: Insecure Deserialization

EPSS: 0.006 (44.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Apache Airflow
Apache Software Foundation Airflow — versions 3.1.8

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

security@apache.org (patch, Issue Tracking)
security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-33858?: CVE-2026-33858 is a high-severity vulnerability in Apache Airflow, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-04-13.
How severe is CVE-2026-33858?: High severity. CVSS v3 base score is 8.8 out of 10.