CVE catalog
CVE-2026-33264
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
- Severity
- Critical · CVSS 9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.65% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | airflow | Not reported | 3.3.0 | fixed |
| Pip | apache-airflow | Not reported | 3.3.0 | fixed |
| Cpe | airflow | Not reported | 3.3.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | airflow | cpe | Not reported | 3.3.0 | Not reported | Not reported | Not reported |
| Pip | apache-airflow | pip | Not reported | 3.3.0 | Not reported | GHSA-2943-9672-R45W | Not reported |
| Cpe | airflow | cpe | Not reported | 3.3.0 | Not reported | NVD-CVE-2026-33264 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [http://www.openwall.com/lists/oss-security/2026/07/07/1]
- [https://github.com/advisories/GHSA-2943-9672-r45w]
- [https://github.com/apache/airflow/pull/66002]
- [https://github.com/apache/airflow/pull/68528]
- [https://lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltj]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-33264]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2223.json]
[CERT-Bund public advisories] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)]