High severity · published Apr 13, 2026
CVE-2026-33858
Apache Airflow: Unsafe Deserialization via Legacy Serialization Keys (__type/__var) Bypass in XCom API
8.8
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AA
Apache Airflow · Apache Software Foundation
3.1.8 before 3.2.0 · source: vendor
AI
Airflow · Apache
3.1.8 before 3.2.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33858
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33858
Issue Tracking
https://github.com/apache/airflow/pull/64148
Mailing List
https://lists.apache.org/thread/1npt3o2x81s0gw9tmfcv4n7p1z9hdmy0
Mailing List
http://www.openwall.com/lists/oss-security/2026/04/13/7
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