# CVE-2026-111395: Apache Airflow: Reserved serialization keys in Dag run conf crash the scheduler or are rebuilt as objects in the Triggerer via deadline callbacks

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

Apache Airflow did not reject reserved serialization keys inside a Dag run's `conf`. A user allowed to trigger a Dag that uses a deadline alert with an asynchronous callback could pass a `conf` that, once the deadline was missed, either crashed the scheduler repeatedly or was rebuilt into objects inside the Triggerer. Users are advised to upgrade to apache-airflow 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/74834

## Affected products and versions

- Apache Software Foundation / Apache Airflow (apache-airflow-core): ≥ 3.2.0; < 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/74834 (CNA: apache; patch)

- https://lists.apache.org/thread.html/qb4qxr40s0q6w9b9t5mfw5qf53pg97p3 (CNA: apache; vendor-advisory)

- http://www.openwall.com/lists/oss-security/2026/11/09/13 (ADP: CVE)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-111395; retrieved 2026-11-09; source updated 2026-11-09

Revision: 666a5b2995821607a96406a455e25c15c855736aff98e895836aec32e6bd2464

Canonical: https://y2.dev/cve/CVE-2026-111395

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