CVE-2026-67587: Apache airflow Apache Airflow Task SDK Callback Vulnerability
HIGHCVE-2026-67587 is a HIGH (CVSS 8.8) apache airflow task sdk callback vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Apache airflow libraries in the PyPI ecosystem. The issue involves apache airflow task sdk callback deserialization can import arbitrary modules in the scheduler. Remediation is available by upgrading affected packages to version 3.3.1.
CVE-2026-67587 at a Glance
Security Impact
CVSS: 8.8
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
How to Fix CVE-2026-67587
To remediate this vulnerability, upgrade all affected Apache airflow dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
pip install apache-airflow>=3.3.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
pip show apache-airflowHow to Check if You Are Affected
To determine whether your Python environment is affected by CVE-2026-67587, inspect your installed packages using pip:
pip show apache-airflowAnalyze the terminal output to locate any version of Apache airflow in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.3.1), your application is affected.
Note: The pip show apache-airflow command checks currently installed packages in your active Python environment.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Apache airflow, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-67587 Affected Apache airflow Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
apache-airflow
|
PyPI |
≥ 3.3.0
< 3.3.1
|
3.3.1
|
References
Frequently Asked Questions
What is CVE-2026-67587?
Which Apache airflow versions are affected?
What version fixes CVE-2026-67587?
Is apache-airflow affected?
What is the CVSS score of CVE-2026-67587?
What CWE is associated with CVE-2026-67587?
How can I check PyPI dependencies for CVE-2026-67587?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-2qjv-p2gc-mjg2",
"modified" : "2026-10-02T23:15:27Z",
"published" : "2026-08-12T18:31:18Z",
"aliases" : [ "CVE-2026-67587" ],
"summary" : "Apache Airflow Task SDK Callback deserialization can import arbitrary modules in the scheduler",
"details" : "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.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "PyPI",
"name" : "apache-airflow"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "3.3.0"
}, {
"fixed" : "3.3.1"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-67587"
}, {
"type" : "WEB",
"url" : "https://github.com/apache/airflow/pull/70704"
}, {
"type" : "WEB",
"url" : "https://github.com/apache/airflow/commit/1baee0bf987eb220f15398e43572e1ed819a0130"
}, {
"type" : "WEB",
"url" : "https://github.com/apache/airflow/commit/2b598cb8b0570c941633be3d16a7eb912f73180c"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/apache/airflow"
}, {
"type" : "WEB",
"url" : "https://github.com/apache/airflow/releases/tag/3.3.1"
}, {
"type" : "WEB",
"url" : "https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2026-3708.yaml"
}, {
"type" : "WEB",
"url" : "https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0"
}, {
"type" : "WEB",
"url" : "https://www.cve.org/CVERecord?id=CVE-2026-58076"
}, {
"type" : "WEB",
"url" : "https://www.cve.org/CVERecord?id=CVE-2026-67260"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-502" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-10-02T23:15:27Z",
"nvd_published_at" : "2026-08-12T16:17:15Z"
}
}