Vulnerability-Lookup

CVE-2026-67587 (GCVE-0-2026-67587)

Vulnerability from cvelistv5 – Published: 2026-08-12 15:32 – Updated: 2026-08-13 12:17

Title

Apache Airflow: DAG-author remote code execution on the Scheduler via a Serde `Callback` deserialization gadget

Summary

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

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-13 12:17 UTC

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

apache

References

4 references

URL	Tags
https://github.com/apache/airflow/pull/70704	patch
https://www.cve.org/CVERecord?id=CVE-2026-58076	related
https://www.cve.org/CVERecord?id=CVE-2026-67260	related
https://lists.apache.org/thread/o00ww4n69qojvsckb…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache Airflow	Affected: 3.3.0 , < 3.3.1 (semver)

Credits

Nguyen Van Hiep (@hypnguyen1209), MBBank Jarek Potiuk

Show details on NVD website

JSON

To clipboard

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GHSA-2QJV-P2GC-MJG2

Vulnerability from github – Published: 2026-08-12 18:31 – Updated: 2026-08-13 15:34

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

8.8 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

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  "affected": [],
  "aliases": [
    "CVE-2026-67587"
  ],
  "database_specific": {
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      "CWE-502"
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-12T16:17:15Z",
    "severity": "HIGH"
  },
  "details": "Apache Airflow\u0027s 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 \u2014 who controls a task instance\u0027s `next_kwargs` through the task execution API \u2014 can therefore cause an arbitrary module to be imported inside the scheduler process, when the scheduler\u0027s `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 \u2014 applying either of those fixes does not address this one. Users are advised to upgrade to apache-airflow 3.3.1 or later.",
  "id": "GHSA-2qjv-p2gc-mjg2",
  "modified": "2026-08-13T15:34:29Z",
  "published": "2026-08-12T18:31:18Z",
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67587"
    },
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      "url": "https://github.com/apache/airflow/pull/70704"
    },
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      "url": "https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0"
    },
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      "type": "WEB",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-58076"
    },
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-67260"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-67587 (GCVE-0-2026-67587)

GHSA-2QJV-P2GC-MJG2

Tags

Sightings

Nomenclature