Vulnerability Details CVE-2026-45426
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 14.2%
CVSS Severity
CVSS v3 Score 3.1
References
Products affected by CVE-2026-45426
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cpe:2.3:a:apache:airflow:3.0.0
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cpe:2.3:a:apache:airflow:3.0.1
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cpe:2.3:a:apache:airflow:3.0.2
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cpe:2.3:a:apache:airflow:3.0.3
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cpe:2.3:a:apache:airflow:3.0.4
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cpe:2.3:a:apache:airflow:3.0.5
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cpe:2.3:a:apache:airflow:3.0.6
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cpe:2.3:a:apache:airflow:3.1.0
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cpe:2.3:a:apache:airflow:3.1.1
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cpe:2.3:a:apache:airflow:3.1.2
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cpe:2.3:a:apache:airflow:3.1.3
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cpe:2.3:a:apache:airflow:3.1.4
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cpe:2.3:a:apache:airflow:3.1.5
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cpe:2.3:a:apache:airflow:3.1.6
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cpe:2.3:a:apache:airflow:3.1.7
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cpe:2.3:a:apache:airflow:3.1.8
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cpe:2.3:a:apache:airflow:3.2.0
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cpe:2.3:a:apache:airflow:3.2.1