CVE-2026-33264
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
apache-airflowPyPI | < 3.3.0 | 3.3.0 |
Affected products
3Patches
Vulnerability mechanics
References
9- github.com/apache/airflow/pull/66002nvdIssue TrackingPatchWEB
- github.com/apache/airflow/pull/68528nvdIssue TrackingPatchWEB
- www.openwall.com/lists/oss-security/2026/07/07/1nvdThird Party AdvisoryMailing ListWEB
- github.com/advisories/GHSA-2943-9672-r45wghsaADVISORY
- lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltjnvdVendor AdvisoryMailing ListWEB
- nvd.nist.gov/vuln/detail/CVE-2026-33264ghsaADVISORY
- github.com/apache/airflow/commit/69b6c54ef17b048ebb0e9a656d0d9e1c99480d6bghsaWEB
- github.com/apache/airflow/commit/7e9bdb245e09373d91fcb7bda575ad4be63aa28dghsaWEB
- github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2026-2082.yamlghsaWEB
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