{"id":"CVE-2026-67587","title":"Apache Airflow's Task SDK rebuilt a `Callback` object from serialized data by re-running its constructor, which imports the module named by the stored callback path","summary":"Apache Airflow's Task SDK rebuilt a `Callback` object from serialized data by re-running its constructor, which imports the module named by the stored callback path. Because `SyncCallback` is itself an Airflow class it passes the default…","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":"2026-09-16T15:17:41.107","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67587","references":[{"url":"https://github.com/apache/airflow/pull/70704","label":"security@apache.org"},{"url":"https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0","label":"security@apache.org"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-58076","label":"security@apache.org"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67260","label":"security@apache.org"}],"tags":["nvd","cve.org","osv","pip"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-08-13T12:17:23.923988Z"},"epss":0.00611,"epssPercentile":0.47965,"aliases":["PYSEC-2026-3708","BIT-airflow-2026-67587"],"ecosystem":"pip","ingestedAt":"2026-08-19T19:22:21.380Z","slug":"CVE-2026-67587","body":"## Overview\n\nApache Airflow's Task SDK rebuilt a `Callback` object from serialized data by re-running its constructor, which imports the module named by the stored callback path. Because `SyncCallback` is itself an Airflow class it passes the default `allowed_deserialization_classes` allow-list, so tightening that setting does not help. A Dag author — who controls a task instance's `next_kwargs` through the task execution API — can therefore cause an arbitrary module to be imported inside the scheduler process, when the scheduler's `awaiting_input` timeout sweep deserializes that value. No non-default configuration is required; the sweep runs unconditionally. Versions before 3.3.0 are not affected: the class existed, but the scheduler sweep that reaches it did not. This is a separate code path from CVE-2026-58076 and CVE-2026-67260, which cover different gadgets reaching deserialization — applying either of those fixes does not address this one. Users are advised to upgrade to apache-airflow 3.3.1 or later.\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`\n\n## Package advisory (CVE-2026-67587)\n\nAffected packages:\n\n- `apache-airflow >= 3.3.0, < 3.3.1`\n\nPatched in:\n\n- `apache-airflow 3.3.1`\n\nSource: https://osv.dev/vulnerability/PYSEC-2026-3708","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}