---
cve: "CVE-2026-33264"
severity: "CRITICAL"
cvss: 9.8
epss: "99%"
vendor: "Apache Software Foundation"
kev: false
exploited: false
published: "2026-07-07 10:16:40"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-16T05:34:01+02:00"
---

# CVE-2026-33264

> 9.8 CRITICAL · 🧪 PoC

## Beschreibung

A 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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- beedefac4f83459f9ce50937bd36c845a8a6b632 (Commit)

## Referenzen

- <https://github.com/apache/airflow/pull/66002>
- <https://github.com/apache/airflow/pull/68528>
- <https://lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltj>
- <http://www.openwall.com/lists/oss-security/2026/07/07/1>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-33264) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_