Apache Airflow: DAG author RCE on webserver via unrestricted import_string() in BaseSerialization.deserialize()

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Summary

CVECVE-2026-33264
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-07 10:16:40 UTC
Updated2026-07-07 16:16:38 UTC
DescriptionA bug in `BaseSerialization.deserialize()` allowed unrestricted `import_string()` of attacker-controlled class paths when the Scheduler / API Server loaded a serialized DAG: a DAG author could embed a malicious trigger into a DAG to gain remote code execution on the API Server / Scheduler process, crossing the Airflow security boundary that DAG-author code must never execute in those processes. Users are advised to upgrade to `apache-airflow` 3.3.0 or later. As a defense-in-depth mitigation, deployments where DAG-author trust is limited can restrict the `[core] allowed_deserialization_classes` config to a narrow allowlist.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-502 | CWE-502 CWE-502: Deserialization of Untrusted Data

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Airflow affected 3.3.0 semver Not specified

References

ReferenceSourceLinkTags
github.com/apache/airflow/pull/68528 [email protected] github.com
www.openwall.com/lists/oss-security/2026/07/07/1 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltj [email protected] lists.apache.org
github.com/apache/airflow/pull/66002 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Ziyu Lin (en)

CNA: bugbunny.ai (en)

CNA: intadd (GitHub handle: @intadd) (en)

CNA: K (en)

CNA: Amogh Desai (@amoghrajesh) (en)

CNA: Jarek Potiuk (en)

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