# CVE-2026-67260: Apache Airflow: DAG-author remote code execution on the Scheduler via awaiting_input next_kwargs deserialization

Status: published. Published: 2026-08-12. Updated: 2026-11-03.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: apache) — https://github.com/apache/airflow/pull/70685

## Affected products and versions

- Apache Software Foundation / Apache Airflow (apache-airflow-core): ≥ 3.3.0; < 3.3.1 (affected, semver). Source: CNA: apache

## Severity and prioritization

- CVSS 3.1: 7.3 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L; source: ADP: CISA-ADP

- CISA KEV: No listing in collected sources

- EPSS: 0.78% as of 2026-11-02; percentile 55.90%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-502

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/apache/airflow/pull/70685 (CNA: apache; patch)

- https://lists.apache.org/thread/vygr0fh82cjzjp5k4vtfmboxryvm3lyn (CNA: apache; vendor-advisory)

- https://www.cve.org/CVERecord?id=CVE-2026-58076 (CNA: apache; related)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-67260; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-67260; retrieved 2026-11-03; source updated Not reported

Revision: bdfd7a420f6c86dc132c32664018cf62a82c565d618e143a33fa6c28c05c129d

Canonical: https://y2.dev/cve/CVE-2026-67260

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