CVE-2026-33858
Apache Airflow: Unsafe Deserialization via Legacy Serialization Keys (__type/__var) Bypass in XCom API
8.8
HIGH
CVSS 3.1
EPSS 0.20%
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.
How to fix CVE-2026-33858
To remediate CVE-2026-33858, upgrade the affected package to a fixed version below.
- —upgrade to 3.2.0 or later
- —upgrade to 3.2.0 or later
- —upgrade to 3.2.0 or later
Is CVE-2026-33858 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- >= 3.1.8, < 3.2.0
- >= 3.1.8, < 3.2.0
- >= 3.1.8, < 3.2.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |