---
id: CVE-2026-58076
title: >-
  Apache Airflow's serialization layer reconstructed exception nodes by calling
  `import_string()` on a class name taken from the serialized blob and
  instantiating it with arguments from the same blob, with no restriction on
  what could be i…
summary: >-
  Apache Airflow's serialization layer reconstructed exception nodes by calling
  `import_string()` on a class name taken from the serialized blob and
  instantiating it with arguments from the same blob, with no restriction on
  what could be i…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-502
vendor: apache
product: airflow
affected:
  - 'airflow >= 3.3.0, < 3.3.1'
patched:
  - airflow 3.3.1
published: '2026-08-12'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:17:38.613'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-58076'
references:
  - url: 'https://github.com/apache/airflow/pull/68511'
    label: security@apache.org
  - url: 'https://lists.apache.org/thread/t81p688t15jozxsng8521o60nh2kfsos'
    label: security@apache.org
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-33264'
    label: security@apache.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-18T13:43:21.351742Z'
epss: 0.00923
epssPercentile: 0.58686
ingestedAt: '2026-09-16T15:58:38.719Z'
---

## Overview

Apache Airflow's serialization layer reconstructed exception nodes by calling `import_string()` on a class name taken from the serialized blob and instantiating it with arguments from the same blob, with no restriction on what could be imported. An operator's `executor_config` reaches that branch, so a Dag author could place a value there that causes an arbitrary callable to be imported and invoked -- for example `subprocess.check_output`, or `builtins.eval` on the `builtins`-prefixed variant. The code runs in the **Scheduler**, which reconstructs serialized Dags in its normal loop with no request involved, and in the **API server**, on any authenticated read of the Dag such as `GET /api/v2/dags/{dag_id}/details`. Both are components the Airflow security model states must never execute Dag-author code, and both hold the metadata database credentials and the JWT signing secret. No non-default configuration is required. This is a **different sink from CVE-2026-33264**, which covered only the trigger branch of the same deserializer: deployments that upgraded in response to that advisory are still affected through the exception branch and must upgrade again. Users are advised to upgrade to apache-airflow 3.3.1 or later, which restricts the imported class to a subclass of `BaseException`.

## Affected

- `airflow >= 3.3.0, < 3.3.1`

## Remediation

Upgrade past the affected range:

- `airflow 3.3.1`