{"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":0.00484,"epssPercentile":0.40849,"ingestedAt":"2026-09-16T15:58:38.719Z","slug":"CVE-2026-58076","body":"## Overview\n\nApache 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`.\n\n## Affected\n\n- `airflow >= 3.3.0, < 3.3.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `airflow 3.3.1`","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}