CVE-2026-33858Network attack vector

Authenticated webserver code execution via crafted XCom payloads

Published Apr 13, 2026 · Updated Apr 13, 2026

Unsafe deserialization in Apache Airflow 3.1.8 through 3.1.x allows remote authenticated users to execute code in the webserver. The XCom API accepts payloads containing reserved serialization keys such as __type and __var, then its read path deserializes those values as trusted objects. DAG-author privileges and XCom write access are required, but successful exploitation grants arbitrary code execution in the webserver process.

CVSS severity8.8
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Apache Airflow 3.1.8 through 3.1.x allows remote authenticated users to execute code in the webserver. The XCom API accepts payloads containing reserved serialization keys such as __type and __var, then its read path deserializes those values as trusted objects. DAG-author privileges and XCom write access are required, but successful exploitation grants arbitrary code execution in the webserver process.

The record

CVE
CVE-2026-33858
Published
Apr 13, 2026
Updated
Apr 13, 2026
Vendor
The Apache Software Foundation
Product
Apache Airflow
Classifications
CWE-502, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 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=3.1.8 <3.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Airflowversion=3.1.8 <3.2.0

Published CVSS scores

8.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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