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Apache Airflow scheduler unsafely deserializes human-in-the-loop task next_kwargs

Type: advisorySources: OSV2 source records

Apache Airflow 3.3.0 moved human-in-the-loop tasks from the triggerer to a new `awaiting_input` task state swept by the scheduler. That sweep deserializes the task instance's `next_kwargs` without an allow-list, so a Dag author — who controls that value through the task execution API — can cause an arbitrary module import and object instantiation inside the scheduler process, or terminate the scheduler job. No non-default configuration is required: the sweep runs unconditionally every 15 seconds, and the default `allowed_deserialization_classes` setting does not cover this code path. Versions before 3.3.0 are not affected, because human-in-the-loop tasks deferred onto the triggerer instead. This is a different code path from CVE-2026-58076, which covers the same unguarded exception-node deserialization reached elsewhere — deployments that applied that fix must upgrade for this issue as well. Users are advised to upgrade to apache-airflow 3.3.1 or later.

Products
apache-airflow
Affected versions
3.3.0, 3.3.1rc1, 3.3.1rc2
Fixed versions
3.3.1
CVEs
CVE-2026-67260
Confirmed fixed CVEs
Not specified
Updated in this feed
30 Oct 2026, 18:13 UTC · Revision 2

Source evidence

Apache Airflow scheduler unsafely deserializes human-in-the-loop task next_kwargs

core-osv · Original source

Published 12 Aug 2026, 18:31 UTC

Apache Airflow 3.3.0 moved human-in-the-loop tasks from the triggerer to a new `awaiting_input` task state swept by the scheduler. That sweep deserializes the task instance's `next_kwargs` without an allow-list, so a Dag author — who controls that value through the task execution API — can cause an arbitrary module import and object instantiation inside the scheduler process, or terminate the scheduler job. No non-default configuration is required: the sweep runs unconditionally every 15 seconds, and the default `allowed_deserialization_classes` setting does not cover this code path. Versions before 3.3.0 are not affected, because human-in-the-loop tasks deferred onto the triggerer instead. This is a different code path from CVE-2026-58076, which covers the same unguarded exception-node deserialization reached elsewhere — deployments that applied that fix must upgrade for this issue as well. Users are advised to upgrade to apache-airflow 3.3.1 or later.

osv:GHSA-q4c3-7575-55j2

apache-airflow

Fixed versions: 3.3.1

Complete source record
{
  "id": "deb7c79d123e07c961b461d0d9b3b3ca98aac34170083f5a8da807f58c56cfc6",
  "url": "https://osv.dev/vulnerability/GHSA-q4c3-7575-55j2",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Apache Airflow scheduler unsafely deserializes human-in-the-loop task next_kwargs",
    "summary": "Apache Airflow 3.3.0 moved human-in-the-loop tasks from the triggerer to a new `awaiting_input` task state swept by the scheduler. That sweep deserializes the task instance's `next_kwargs` without an allow-list, so a Dag author — who controls that value through the task execution API — can cause an arbitrary module import and object instantiation inside the scheduler process, or terminate the scheduler job. No non-default configuration is required: the sweep runs unconditionally every 15 seconds, and the default `allowed_deserialization_classes` setting does not cover this code path. Versions before 3.3.0 are not affected, because human-in-the-loop tasks deferred onto the triggerer instead. This is a different code path from CVE-2026-58076, which covers the same unguarded exception-node deserialization reached elsewhere — deployments that applied that fix must upgrade for this issue as well. Users are advised to upgrade to apache-airflow 3.3.1 or later.",
    "evidence": "osv:GHSA-q4c3-7575-55j2",
    "products": [
      {
        "name": {
          "value": "apache-airflow",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.3.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "3.3.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.3.1rc1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.3.1rc2",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-q4c3-7575-55j2",
      "aliases": [
        "BIT-airflow-2026-67260",
        "CVE-2026-67260",
        "GHSA-q4c3-7575-55j2",
        "PYSEC-2026-3707"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.3.0"
                },
                {
                  "fixed": "3.3.1"
                }
              ]
            }
          ],
          "package": {
            "name": "apache-airflow",
            "purl": "pkg:pypi/apache-airflow",
            "ecosystem": "PyPI"
          },
          "versions": [
            "3.3.0",
            "3.3.1rc1",
            "3.3.1rc2"
          ],
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-q4c3-7575-55j2/GHSA-q4c3-7575-55j2.json"
          }
        }
      ],
      "modified": "2026-10-02T23:41:04.597715151Z",
      "provider": "osv",
      "references": [
        "https://nvd.nist.gov/vuln/detail/CVE-2026-67260",
        "https://github.com/apache/airflow/pull/70685",
        "https://github.com/apache/airflow/commit/18b622920cf0f486155075125ecdcabc752b1eca",
        "https://github.com/apache/airflow/commit/a1ab0653121829675ad864080d2cd9d3d1688b01",
        "https://github.com/apache/airflow",
        "https://github.com/apache/airflow/releases/tag/3.3.1",
        "https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2026-3707.yaml",
        "https://lists.apache.org/thread/vygr0fh82cjzjp5k4vtfmboxryvm3lyn",
        "https://www.cve.org/CVERecord?id=CVE-2026-58076"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-502"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": "2026-08-12T16:17:14Z",
        "github_reviewed_at": "2026-10-02T23:15:49Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-67260",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 81405,
  "published_at": "2026-08-12T18:31:18+00:00"
}

PYSEC-2026-3707

core-osv · Original source

Published 12 Aug 2026, 16:17 UTC

Apache Airflow 3.3.0 moved human-in-the-loop tasks from the triggerer to a new `awaiting_input` task state swept by the scheduler. That sweep deserializes the task instance's `next_kwargs` without an allow-list, so a Dag author — who controls that value through the task execution API — can cause an arbitrary module import and object instantiation inside the scheduler process, or terminate the scheduler job. No non-default configuration is required: the sweep runs unconditionally every 15 seconds, and the default `allowed_deserialization_classes` setting does not cover this code path. Versions before 3.3.0 are not affected, because human-in-the-loop tasks deferred onto the triggerer instead. This is a different code path from CVE-2026-58076, which covers the same unguarded exception-node deserialization reached elsewhere — deployments that applied that fix must upgrade for this issue as well. Users are advised to upgrade to apache-airflow 3.3.1 or later.

osv:PYSEC-2026-3707

apache-airflow

Fixed versions: 3.3.1

Complete source record
{
  "id": "d571a523431151c3f4bfe57d59d6a8036e5310af8044dfec1b884bf9e7ea295f",
  "url": "https://osv.dev/vulnerability/PYSEC-2026-3707",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "PYSEC-2026-3707",
    "summary": "Apache Airflow 3.3.0 moved human-in-the-loop tasks from the triggerer to a new `awaiting_input` task state swept by the scheduler. That sweep deserializes the task instance's `next_kwargs` without an allow-list, so a Dag author — who controls that value through the task execution API — can cause an arbitrary module import and object instantiation inside the scheduler process, or terminate the scheduler job. No non-default configuration is required: the sweep runs unconditionally every 15 seconds, and the default `allowed_deserialization_classes` setting does not cover this code path. Versions before 3.3.0 are not affected, because human-in-the-loop tasks deferred onto the triggerer instead. This is a different code path from CVE-2026-58076, which covers the same unguarded exception-node deserialization reached elsewhere — deployments that applied that fix must upgrade for this issue as well. Users are advised to upgrade to apache-airflow 3.3.1 or later.",
    "evidence": "osv:PYSEC-2026-3707",
    "products": [
      {
        "name": {
          "value": "apache-airflow",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.3.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "3.3.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.3.1rc1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.3.1rc2",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "PYSEC-2026-3707",
      "aliases": [
        "BIT-airflow-2026-67260",
        "CVE-2026-67260",
        "GHSA-q4c3-7575-55j2",
        "PYSEC-2026-3707"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.3.0"
                },
                {
                  "fixed": "3.3.1"
                }
              ]
            }
          ],
          "package": {
            "name": "apache-airflow",
            "purl": "pkg:pypi/apache-airflow",
            "ecosystem": "PyPI"
          },
          "versions": [
            "3.3.0",
            "3.3.1rc1",
            "3.3.1rc2"
          ],
          "database_specific": {
            "source": "https://github.com/pypa/advisory-database/blob/main/vulns/apache-airflow/PYSEC-2026-3707.yaml"
          },
          "ecosystem_specific": {}
        }
      ],
      "modified": "2026-10-15T14:45:06.283288132Z",
      "provider": "osv",
      "references": [
        "https://www.cve.org/CVERecord?id=CVE-2026-58076",
        "https://lists.apache.org/thread/vygr0fh82cjzjp5k4vtfmboxryvm3lyn",
        "https://github.com/apache/airflow/pull/70685",
        "https://github.com/advisories/GHSA-q4c3-7575-55j2"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-67260",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 332638,
  "published_at": "2026-08-12T16:17:14.813+00:00"
}