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High

Apache Airflow 3.3.0 moved human-in-the-loop tasks from the triggerer to a new `awaiting_input` task state swept by the scheduler. That sweep deserializes the task instance's `next_kwargs` without an

  • Disclosed: 12.08.2026
  • Updated: 15.10.2026 18:17

Apache Airflow 3.3.0 moved human-in-the-loop tasks from the triggerer to a new awaiting_input task state swept by the scheduler. That sweep deserializes the task instance's next_kwargs without an allow-list, so a Dag author — who controls that value through the task execution API — can cause an arbitrary module import and object instantiation inside the scheduler process, or terminate the scheduler job. No non-default configuration is required: the sweep runs unconditionally every 15 seconds, and the default allowed_deserialization_classes setting does not cover this code path. Versions before 3.3.0 are not affected, because human-in-the-loop tasks deferred onto the triggerer instead. This is a different code path from CVE-2026-58076, which covers the same unguarded exception-node deserialization reached elsewhere — deployments that applied that fix must upgrade for this issue as well. Users are advised to upgrade to apache-airflow 3.3.1 or later.

Affected software

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PlatformPackageVulnerable versionsFixed in
Python (PyPI) apache-airflow >= 3.3.0, < 3.3.1 3.3.1

References

CVSS score 7.3/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness (CWE)
CWE-502
Platform
Python (PyPI)
Package
apache-airflow
Disclosed
12.08.2026
Updated
15.10.2026 18:17

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-3707 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-q4c3-7575-55j2 - CC BY 4.0

Vulnerability history: apache-airflow

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (158) in the archive
Total entries
158
First → latest
08.2018 09.2026
Without a fix
4
Exploited in attacks
2

Severity breakdown

  • Critical 16
  • High 49
  • Medium 86
  • Low 7

Disclosures per year

Severity:
  1. Apache Airflow: the Core API logout endpoint revokes only a session token presented as the _token cookie. When a client logs out presenting its credential as an Authorization bearer header instead, th
    Critical · 9.1 CVE-2026-86473 >= 3.0.0, < 3.3.2 3.3.2
  2. Apache Airflow's Backfill API authorized a request against a Dag id supplied by the caller whenever the `backfill_id` path segment failed to parse. The authorization dependency parsed it with `int()`
    High · 7.5 CVE-2026-68968 < 3.3.1 3.3.1
  3. 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 a
    High · 8.8 CVE-2026-67587 >= 3.3.0, < 3.3.1 3.3.1
  4. Apache Airflow 3.3.0 moved human-in-the-loop tasks from the triggerer to a new `awaiting_input` task state swept by the scheduler. That sweep deserializes the task instance's `next_kwargs` without an this entry
    High · 7.3 CVE-2026-67260 >= 3.3.0, < 3.3.1 3.3.1
  5. Apache Airflow's serialization layer reconstructed exception nodes by calling `import_string()` on a class name taken from the serialized blob and instantiating it with arguments from the same blob, w
    High · 8.8 CVE-2026-58076 >= 3.3.0, < 3.3.1 3.3.1
  6. A bug in `BaseSerialization.deserialize()` allowed unrestricted `import_string()` of attacker-controlled class paths when the Scheduler / API Server loaded a serialized DAG: a DAG author could embed a
    Critical · 9.8 CVE-2026-33264 < 3.3.0 3.3.0
  7. A bug in Apache Airflow's XCom PATCH endpoint `PATCH /api/v2/xcomEntries/{key}` allowed an authenticated UI/API user with XCom write permission on a Dag to set XCom entries under reserved key names (e
    High · 8.8 CVE-2026-42359 >= 3.2.0, < 3.2.2 3.2.2
  8. A bug in Apache Airflow's bulk Task Instances API (`PATCH/DELETE /api/v2/dags/{dag_id}/dagRuns/{dag_run_id}/taskInstances`) evaluated authorization against the `dag_id` resolved from the URL path whil
    High · 7.5 CVE-2026-41084 >= 3.2.0, < 3.2.2 3.2.2
  9. Apache Airflow's official documentation at `core-concepts/dag-run.html` ("Passing Parameters when triggering Dags") showed a verbatim `BashOperator(bash_command="echo value: {{ dag_run.conf['conf1'] }
    Critical · 9.1 CVE-2026-42252 >= 3.0.0, < 3.2.2 3.2.2
  10. Apache Airflow: Authenticated users can bypass the `is_safe_url` check
    High · 7.2 CVE-2026-40961 < 3.2.2 3.2.2
  11. Apache Airflow Vulnerable to Deserialization of Untrusted Data
    High · 7.3 CVE-2026-45360 >= 3.2.0, < 3.2.2 3.2.2
  12. Apache Airflow allows code execution through crafted XCom payloads
    High · 7.2 CVE-2026-25917 < 3.2.0 3.2.0
  13. Apache Airflow: JWT token appearing in logs
    High · 7.5 CVE-2026-31987 >= 3.0.0, < 3.2.0 3.2.0
  14. Apache Airflow: RCE by race condition in example_xcom dag
    High · 8.1 CVE-2025-54550 < 3.2.0 3.2.0
  15. Dag Authors, who normally should not be able to execute code in the webserver context could craft XCom payload causing the webserver to execute arbitrary code. Since Dag Authors are already highly tru
    High · 8.8 CVE-2026-33858 >= 3.1.8, < 3.2.0 3.2.0
  16. Apache Airflow: JWT token still valid after logout
    Critical · 9.1 CVE-2025-57735 >= 3.0.0, < 3.2.0 3.2.0
  17. Apache Airflow versions 3.1.0 through 3.1.7 missing authorization vulnerability in the Execution API's Human-in-the-Loop (HITL) endpoints that allows any authenticated task instance to read, approve,
    High · 8.1 CVE-2026-30911 >= 3.1.0, < 3.1.8 3.1.8
  18. Apache Airflow versions 3.1.0 through 3.1.7 session token (_token) in cookies is set to path=/ regardless of the configured [webserver] base_url or [api] base_url.
    High · 7.5 CVE-2026-28779 >= 3.0.0, < 3.1.8 3.1.8
  19. Apache Airflow vulnerable to Code Injection in the web-server context via LogTemplate table
    High · 8.4 CVE-2024-56373 < 2.11.1 2.11.1
  20. Apache Airflow proxy credentials for various providers might leak in task logs
    High · 7.5 CVE-2025-68675 >= 3.0.0b1, < 3.1.6, < 2.11.1 3.1.6, 2.11.1
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