CVE-2026-45426 json
Apache Airflow: Log server JWT authorization bypass via Python lstrip() character stripping allows cross-Dag log access
published 2026-06-01 5 mo ago modified 2026-11-03 6 d ago also BIT-airflow-2026-45426 , EUVD-2026-33585 , GHSA-x5wm-j6wh-2834 , PYSEC-2026-174
- cvss
- 3.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi apache-airflow 3.2.2
- bitnami airflow 3.2.2
- Apache Software Foundation Apache Airflow 3.2.2
- github.com/apache/airflow#66749 pull request
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N |
| GitHub | 3.1 | 3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N |
| CNA | 3.1 | 3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N |
| OSV | 3.1 | 3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | apache-airflow | >=3.0.0, <3.2.2 |
3.2.2 |
| bitnami | airflow | >=3.0.0, <3.2.2 |
3.2.2 |
Affected products
- Apache Software Foundation Apache Airflow
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/apache/airflow/pull/66749
patch, web, issue-tracking
-
lists.apache.org
/thread/hz1q7vg65vq2h4fobv5ww8tp257fbqj9
vendor-advisory, web, mailing-list, advisory
-
openwall.com
/lists/oss-security/2026/05/31/13
web, mailing-list, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-45426
advisory, web
-
github.com
/apache/airflow
package
-
github.com
/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2026-174.yaml
web
-
github.com
/advisories/GHSA-x5wm-j6wh-2834
advisory
Sources
- CVE List CVE-2026-45426
- GitHub Advisory GHSA-x5wm-j6wh-2834
- NVD CVE-2026-45426
- OSV BIT-airflow-2026-45426
- OSV PYSEC-2026-174
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