CVE-2026-33264Network attack vector

DAG-author RCE via unrestricted class import

Published Jul 7, 2026 · Updated Jul 7, 2026

Deserialization in Apache Airflow before 3.3.0 allows remote authenticated users to execute code in Scheduler and API Server processes. BaseSerialization.deserialize() passes a class path from a serialized DAG trigger directly to import_string() without restricting the imported class. DAG-author access is required, and successful exploitation runs code with the Scheduler or API Server process privileges across Airflow’s DAG-processing trust boundary.

CVSS severity9.8
Critical
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Apache Airflow before 3.3.0 allows remote authenticated users to execute code in Scheduler and API Server processes. BaseSerialization.deserialize() passes a class path from a serialized DAG trigger directly to import_string() without restricting the imported class. DAG-author access is required, and successful exploitation runs code with the Scheduler or API Server process privileges across Airflow’s DAG-processing trust boundary.

The record

CVE
CVE-2026-33264
Published
Jul 7, 2026
Updated
Jul 7, 2026
Vendor
The Apache Software Foundation
Product
Apache Airflow
Classifications
CWE-502, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Airflowversion=0 <3.3.0

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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