# CVE-2026-82337: Apache Airflow: DeadlineAlert fields bypass plugin-registration gate for scheduler-side deserialization

Status: published. Published: 2026-11-09. Updated: 2026-11-09.

Apache Airflow rebuilt deadline alert fields through generic deserialization, which imports and instantiates the class named in the serialized Dag, in the scheduler and API server. A Dag author could cause classes within Airflow's deserialization allow list to be constructed in those processes with arguments they control. Deployments whose Dags use deadline alerts are affected.

This is an incomplete fix of CVE-2026-45360, which only hardened the `reference` field; deployments that applied that fix remain affected through the `callback` and `interval` fields.

Users of apache-airflow are recommended to upgrade to 3.4.0 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/72651
- 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/74830

## Affected products and versions

- Apache Software Foundation / Apache Airflow (apache-airflow-core): ≥ 0; < 3.4.0 (affected, semver). Source: CNA: apache

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- 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/72651 (CNA: apache; patch)

- https://github.com/apache/airflow/pull/74830 (CNA: apache; patch)

- https://www.cve.org/CVERecord?id=CVE-2026-45360 (CNA: apache; related)

- https://lists.apache.org/thread.html/9v8f3hlm6pxbwl2jt1c2bw84s80gg6kp (CNA: apache; vendor-advisory)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-82337; retrieved 2026-11-09; source updated 2026-11-09

Revision: 398c6f1b33fd40f89a7556a6b47da8606b4a787795bfb119bffa65d12d938491

Canonical: https://y2.dev/cve/CVE-2026-82337

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