CVE-2026-67587
Apache Airflow: DAG-author remote code execution on the Scheduler via a Serde `Callback` deserialization gadget
Description
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.
INFO
Published Date :
Aug. 12, 2026, 4:17 p.m.
Last Modified :
Sept. 16, 2026, 3:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Upgrade Apache Airflow to version 3.3.1 or later.
- Apply vendor patches for affected Apache Airflow versions.
- Review and restrict DAG author access to task execution API.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-67587.
| URL | Resource |
|---|---|
| https://github.com/apache/airflow/pull/70704 | Issue Tracking Patch |
| https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0 | Mailing List Vendor Advisory |
| https://www.cve.org/CVERecord?id=CVE-2026-58076 | Not Applicable |
| https://www.cve.org/CVERecord?id=CVE-2026-67260 | Not Applicable |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-67587 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-67587
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-67587 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-67587 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Sep. 16, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/67xxx/CVE-2026-67587.json">CVE-2026-67587</a> Added Reference https://github.com/apache/airflow/pull/70704 Added Reference https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0 Added Reference https://www.cve.org/CVERecord?id=CVE-2026-58076 Added Reference https://www.cve.org/CVERecord?id=CVE-2026-67260 Removed Reference https://github.com/apache/airflow/pull/70704 Removed Reference https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0 Removed Reference https://www.cve.org/CVERecord?id=CVE-2026-58076 Removed Reference https://www.cve.org/CVERecord?id=CVE-2026-67260 Removed Reference Type https://github.com/apache/airflow/pull/70704 Types: Issue Tracking, Patch Removed Reference Type https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0 Types: Mailing List, Vendor Advisory Removed Reference Type https://www.cve.org/CVERecord?id=CVE-2026-58076 Types: Not Applicable Removed Reference Type https://www.cve.org/CVERecord?id=CVE-2026-67260 Types: Not Applicable -
Initial Analysis by [email protected]
Aug. 17, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:* versions from (including) 3.3.0 up to (excluding) 3.3.1 Added Reference Type Apache Software Foundation: https://github.com/apache/airflow/pull/70704 Types: Issue Tracking, Patch Added Reference Type Apache Software Foundation: https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0 Types: Mailing List, Vendor Advisory Added Reference Type Apache Software Foundation: https://www.cve.org/CVERecord?id=CVE-2026-58076 Types: Not Applicable Added Reference Type Apache Software Foundation: https://www.cve.org/CVERecord?id=CVE-2026-67260 Types: Not Applicable -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added SSVC {'id': 'CVE-2026-67587', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-13T12:17:23.923988Z'} -
New CVE Received by [email protected]
Aug. 12, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Apache Software Foundation', 'product': 'Apache Airflow', 'versions': [{'status': 'affected', 'version': '3.3.0', 'lessThan': '3.3.1', 'versionType': 'semver'}], 'packageName': 'apache-airflow', 'collectionURL': 'https://pypi.python.org', 'defaultStatus': 'unaffected'}] Added Description 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. Added CWE CWE-502 Added Reference https://github.com/apache/airflow/pull/70704 Added Reference https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0 Added Reference https://www.cve.org/CVERecord?id=CVE-2026-58076 Added Reference https://www.cve.org/CVERecord?id=CVE-2026-67260