CVE-2026-45426
LowCVSS 3.1Exploitation Probability (EPSS)
Low risk27th percentile - higher than 27% of all known CVEs
Summary
In Apache Airflow, exploitation requires an already authenticated Airflow worker with a valid Log-server JWT for at least one Dag. The 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 character from a set, not a prefix, so a JWT for a Dag named `dag_a` would authorize log access to any other Dag whose name began with any subset of characters `{d, a, g, _}`. An authenticated worker could enumerate and read worker logs of other Dags, leaking task output and error traces beyond the per-Dag isolation boundary.
Risk Assessment
In multi-team deployments relying on per-Dag log isolation, this vulnerability allows unauthorized access to logs of other Dags, potentially leaking sensitive task output and error messages.
Recommendation
Upgrade Apache Airflow to version 3.2.2 or later, which fixes this vulnerability by properly validating the path prefix instead of using `str.lstrip()`.
Original NVD description (English source)
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.