CVE-2026-45426Apache Airflow: Log server JWT authorization bypass via Python lstrip() character stripping allows cross-Dag log access

Official description

Exploitation requires the attacker to already be an authenticated Airflow worker holding a valid Log-server JWT issued for at least one Dag. Apache Airflow's Log server authorized JWT tokens against Dag IDs by applying Python's `str.lstrip()` to the requested path segment when verifying the JWT's `sub` claim. `str.lstrip()` strips any of a *set* of characters from the left (not a prefix), so a JWT issued for a Dag named e.g. `dag_a` would authorize log access to any other Dag whose name began with any subset of the characters `{d, a, g, _}` (e.g. `dag_attacker`, `aaaa_target`, `_dag_secret`). Such an authenticated worker could enumerate and read worker logs of other Dags whose names happened to share that character-class prefix, leaking task output and error traces beyond the documented per-Dag isolation boundary. Affects deployments relying on per-Dag log-access scoping (multi-team, shared-executor, shared-worker topologies). Users are advised to upgrade to `apache-airflow` 3.2.2 or later.

Affected packages & fixed versions

Affected products (as reported)

References

• https://github.com/apache/airflow/pull/66749 patch
• https://lists.apache.org/thread/hz1q7vg65vq2h4fobv5ww8tp257fbqj9 vendor-advisory
• http://www.openwall.com/lists/oss-security/2026/05/31/13