Vulnerability-Lookup

GHSA-2943-9672-R45W

Vulnerability from github – Published: 2026-07-07 12:31 – Updated: 2026-09-04 19:23

Summary

Apache Airflow allows code execution through unsafe serialized DAG deserialization

Details

A bug in BaseSerialization.deserialize() allowed unrestricted import_string() of attacker-controlled class paths when the Scheduler / API Server loaded a serialized DAG: a DAG author could embed a malicious trigger into a DAG to gain remote code execution on the API Server / Scheduler process, crossing the Airflow security boundary that DAG-author code must never execute in those processes. Users are advised to upgrade to apache-airflow 3.3.0 or later. As a defense-in-depth mitigation, deployments where DAG-author trust is limited can restrict the [core] allowed_deserialization_classes config to a narrow allowlist.

Severity

9.8 (Critical)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "apache-airflow"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33264"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-04T19:23:01Z",
    "nvd_published_at": "2026-07-07T10:16:40Z",
    "severity": "CRITICAL"
  },
  "details": "A bug in `BaseSerialization.deserialize()` allowed unrestricted `import_string()` of attacker-controlled class paths when the Scheduler / API Server loaded a serialized DAG: a DAG author could embed a malicious trigger into a DAG to gain remote code execution on the API Server / Scheduler process, crossing the Airflow security boundary that DAG-author code must never execute in those processes. Users are advised to upgrade to `apache-airflow` 3.3.0 or later. As a defense-in-depth mitigation, deployments where DAG-author trust is limited can restrict the `[core] allowed_deserialization_classes` config to a narrow allowlist.",
  "id": "GHSA-2943-9672-r45w",
  "modified": "2026-09-04T19:23:01Z",
  "published": "2026-07-07T12:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33264"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/airflow/pull/66002"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/airflow/pull/68528"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/airflow/commit/69b6c54ef17b048ebb0e9a656d0d9e1c99480d6b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/airflow/commit/7e9bdb245e09373d91fcb7bda575ad4be63aa28d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/airflow"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2026-2082.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltj"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/07/1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache Airflow allows code execution through unsafe serialized DAG deserialization"
}

CVE-2026-33264 (GCVE-0-2026-33264)

Vulnerability from cvelistv5 – Published: 2026-07-07 09:20 – Updated: 2026-07-08 03:56

Title

Apache Airflow: DAG author RCE on webserver via unrestricted import_string() in BaseSerialization.deserialize()

Summary

A bug in `BaseSerialization.deserialize()` allowed unrestricted `import_string()` of attacker-controlled class paths when the Scheduler / API Server loaded a serialized DAG: a DAG author could embed a malicious trigger into a DAG to gain remote code execution on the API Server / Scheduler process, crossing the Airflow security boundary that DAG-author code must never execute in those processes. Users are advised to upgrade to `apache-airflow` 3.3.0 or later. As a defense-in-depth mitigation, deployments where DAG-author trust is limited can restrict the `[core] allowed_deserialization_classes` config to a narrow allowlist.

Severity

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-07 00:00 UTC

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

apache mitre root

References

4 references

URL	Tags
https://github.com/apache/airflow/pull/66002	patch
https://github.com/apache/airflow/pull/68528	patch
https://lists.apache.org/thread/otvdw8qt2y7xy2n5n…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/07/07/1

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache Airflow	Affected: 0 , < 3.3.0 (semver)

Credits

Ziyu Lin bugbunny.ai intadd (GitHub handle: @intadd) K Amogh Desai (@amoghrajesh) Jarek Potiuk

Show details on NVD website

JSON

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{
  "containers": {
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        "providerMetadata": {
          "dateUpdated": "2026-07-07T12:48:06.041Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/07/07/1"
          }
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        "title": "CVE Program Container"
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              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-33264",
                "options": [
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                "timestamp": "2026-07-07T00:00:00+00:00",
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        "providerMetadata": {
          "dateUpdated": "2026-07-08T03:56:40.205Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          "collectionURL": "https://pypi.python.org",
          "defaultStatus": "unaffected",
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          "product": "Apache Airflow",
          "vendor": "Apache Software Foundation",
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      "credits": [
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        },
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        },
        {
          "lang": "en",
          "type": "remediation developer",
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        }
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          "supportingMedia": [
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      "metrics": [
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            "content": {
              "text": "important"
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      "problemTypes": [
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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

GHSA-2943-9672-R45W

CVE-2026-33264 (GCVE-0-2026-33264)

Tags

Sightings

Nomenclature