# CVE-2026-67587: Apache Airflow: DAG-author remote code execution on the Scheduler via a Serde `Callback` deserialization gadget

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

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 an Airflow class it passes the default `allowed_deserialization_classes` allow-list, so tightening that setting does not help. A Dag author — who controls a task instance's `next_kwargs` through the task execution API — can therefore cause an arbitrary module to be imported inside the scheduler process, when the scheduler's `awaiting_input` timeout sweep deserializes that value. No non-default configuration is required; the sweep runs unconditionally. Versions before 3.3.0 are not affected: the class existed, but the scheduler sweep that reaches it did not. This is a separate code path from CVE-2026-58076 and CVE-2026-67260, which cover different gadgets reaching deserialization — applying either of those fixes does not address this one. 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/70704

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

- CISA KEV: No listing in collected sources

- EPSS: 0.61% as of 2026-11-02; percentile 49.29%

- SSVC: exploitation none; automatable no; technical impact total; 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/70704 (CNA: apache; patch)

- https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0 (CNA: apache; vendor-advisory)

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

- https://www.cve.org/CVERecord?id=CVE-2026-67260 (CNA: apache; related)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-67587; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-67587; retrieved 2026-11-03; source updated Not reported

Revision: 49b50482ab1913ac46d4d971b665dba154f3371403bf3e06b212e5a89e70eaf4

Canonical: https://y2.dev/cve/CVE-2026-67587

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