---
id: "CVE-2026-111395"
page: "https://infrastack.ai/live/CVE-2026-111395"
kind: "vulnerability"
aliases: ["CVE-2026-111395"]
title: "Apache Airflow: Dag run conf can crash scheduler or triggerer"
severity: "medium"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: [{"name": "apache-airflow", "fixed": [], "affected": "", "ecosystem": "pypi"}]
ecosystems: ["pypi"]
tags: ["apache-airflow", "python", "runtime", "scheduler", "triggerer"]
not_affected_if: ["no-deadline-alerts-async-callbacks", "only-trusted-dag-triggerers"]
published_at: "2026-11-09T10:17:02+00:00"
first_seen_at: "2026-11-09T10:25:47+00:00"
updated_at: "2026-11-09T10:26:58+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111395", "first_seen_at": "2026-11-09T10:25:47+00:00"}]
exploit_sources: []
---

# Apache Airflow: Dag run conf can crash scheduler or triggerer

Link for people: https://infrastack.ai/live/CVE-2026-111395 (this .md is for agents)

Apache Airflow did not reject reserved serialization keys in a Dag run's conf. A user who can trigger a Dag with a deadline alert using an asynchronous callback can make the scheduler crash repeatedly or have objects rebuilt inside the Triggerer once the deadline is missed.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- pypi:apache-airflow affected range not listed fixed no fixed version listed

## How to check

- Check the installed version with `airflow version` or `pip show apache-airflow`; versions before `3.4.0` are affected.
- Look for Dags that define a deadline alert with an asynchronous callback.
- Review which users can trigger Dags and pass a `conf`.

## Fix

- `apache-airflow` `3.4.0` or later

## Timeline

- 2026-11-09T10:25:47+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111395

## From the sources

Apache Airflow did not reject reserved serialization keys inside a Dag run's `conf`. A user allowed to trigger a Dag that uses a deadline alert with an asynchronous callback could pass a `conf` that, once the deadline was missed, either crashed the scheduler repeatedly or was rebuilt into objects inside the Triggerer. Users are advised to upgrade to apache-airflow 3.4.0 or later.

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