Vulnerability-Lookup

GHSA-X8MH-94WC-33GV

Vulnerability from github – Published: 2026-04-30 12:33 – Updated: 2026-05-22 13:04

Summary

apache-airflow-providers-smtp: No certificate validation on SMTP STARTTLS connections in SMTP provider

Details

Apache Airflow's SMTP provider SmtpHook called Python's smtplib.SMTP.starttls() without an SSL context, so no certificate validation was performed on the TLS upgrade. A man-in-the-middle between the Airflow worker and the SMTP server could present a self-signed certificate, complete the STARTTLS upgrade, and capture the SMTP credentials sent during the subsequent login() call. Users are advised to upgrade to the apache-airflow-providers-smtp version that contains the fix.

Severity

5.9 (Medium)


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

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "apache-airflow-providers-smtp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "3.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41016"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-22T13:04:58Z",
    "nvd_published_at": "2026-04-30T10:16:01Z",
    "severity": "MODERATE"
  },
  "details": "Apache Airflow\u0027s SMTP provider `SmtpHook` called Python\u0027s `smtplib.SMTP.starttls()` without an SSL context, so no certificate validation was performed on the TLS upgrade. A man-in-the-middle between the Airflow worker and the SMTP server could present a self-signed certificate, complete the STARTTLS upgrade, and capture the SMTP credentials sent during the subsequent `login()` call. Users are advised to upgrade to the `apache-airflow-providers-smtp` version that contains the fix.",
  "id": "GHSA-x8mh-94wc-33gv",
  "modified": "2026-05-22T13:04:58Z",
  "published": "2026-04-30T12:33:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41016"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/airflow/pull/65346"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/airflow"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow-providers-smtp/PYSEC-2026-24.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/gb202qy5r31bgdd3d51d7s5o1jh40kc4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "apache-airflow-providers-smtp: No certificate validation on SMTP STARTTLS connections in SMTP provider"
}

CVE-2026-41016 (GCVE-0-2026-41016)

Vulnerability from cvelistv5 – Published: 2026-04-30 09:09 – Updated: 2026-04-30 13:17

Title

Apache Airflow Providers SMTP: No certificate validation on SMTP STARTTLS connections in SMTP provider

Summary

Apache Airflow's SMTP provider `SmtpHook` called Python's `smtplib.SMTP.starttls()` without an SSL context, so no certificate validation was performed on the TLS upgrade. A man-in-the-middle between the Airflow worker and the SMTP server could present a self-signed certificate, complete the STARTTLS upgrade, and capture the SMTP credentials sent during the subsequent `login()` call. Users are advised to upgrade to the `apache-airflow-providers-smtp` version that contains the fix.

Severity

5.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-30 13:16 UTC

CWE

CWE-295 - Improper Certificate Validation

Assigner

apache mitre root Scorecard

References

2 references

URL	Tags
https://github.com/apache/airflow/pull/65346	patch
https://lists.apache.org/thread/gb202qy5r31bgdd3d…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache Airflow Providers SMTP	Affected: 2.0.0 , < 3.0.0 (semver)

Credits

Francis Bergin (@francisbergin) Jarek Potiuk

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 5.9,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-41016",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-30T13:16:50.020130Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-30T13:17:14.490Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pypi.python.org",
          "defaultStatus": "unaffected",
          "packageName": "apache-airflow-providers-smtp",
          "product": "Apache Airflow Providers SMTP",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThan": "3.0.0",
              "status": "affected",
              "version": "2.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Francis Bergin (@francisbergin)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Jarek Potiuk"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Apache Airflow\u0027s SMTP provider `SmtpHook` called Python\u0027s `smtplib.SMTP.starttls()` without an SSL context, so no certificate validation was performed on the TLS upgrade. A man-in-the-middle between the Airflow worker and the SMTP server could present a self-signed certificate, complete the STARTTLS upgrade, and capture the SMTP credentials sent during the subsequent `login()` call. Users are advised to upgrade to the `apache-airflow-providers-smtp` version that contains the fix."
            }
          ],
          "value": "Apache Airflow\u0027s SMTP provider `SmtpHook` called Python\u0027s `smtplib.SMTP.starttls()` without an SSL context, so no certificate validation was performed on the TLS upgrade. A man-in-the-middle between the Airflow worker and the SMTP server could present a self-signed certificate, complete the STARTTLS upgrade, and capture the SMTP credentials sent during the subsequent `login()` call. Users are advised to upgrade to the `apache-airflow-providers-smtp` version that contains the fix."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "text": "low"
            },
            "type": "Textual description of severity"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-295",
              "description": "CWE-295: Improper Certificate Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-30T09:09:45.529Z",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "shortName": "apache"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/apache/airflow/pull/65346"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.apache.org/thread/gb202qy5r31bgdd3d51d7s5o1jh40kc4"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Apache Airflow Providers SMTP: No certificate validation on SMTP STARTTLS connections in SMTP provider",
      "x_generator": {
        "engine": "airflow-s/generate_cve_json.py"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2026-41016",
    "datePublished": "2026-04-30T09:09:45.529Z",
    "dateReserved": "2026-04-16T02:38:58.158Z",
    "dateUpdated": "2026-04-30T13:17:14.490Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

PYSEC-2026-24

Vulnerability from pysec - Published: 2026-04-30 10:16 - Updated: 2026-05-20 09:18

Details

Severity

5.9 (Medium)


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

Impacted products

Name	purl
apache-airflow-providers-smtp	pkg:pypi/apache-airflow-providers-smtp

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "apache-airflow-providers-smtp",
        "purl": "pkg:pypi/apache-airflow-providers-smtp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "3.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.0",
        "2.0.1",
        "2.0.1rc1",
        "2.0.2",
        "2.0.2rc1",
        "2.0.3",
        "2.0.3rc1",
        "2.1.0",
        "2.1.0rc1",
        "2.1.1",
        "2.1.1rc1",
        "2.1.2",
        "2.1.2rc1",
        "2.2.0",
        "2.2.0rc1",
        "2.2.1",
        "2.2.1rc1",
        "2.3.0",
        "2.3.0rc1",
        "2.3.1",
        "2.3.1rc1",
        "2.3.2",
        "2.3.2rc1",
        "2.4.0",
        "2.4.0rc1",
        "2.4.1",
        "2.4.1rc1",
        "2.4.2",
        "2.4.2rc1",
        "2.4.3",
        "2.4.3rc1",
        "2.4.4",
        "2.4.4rc1",
        "2.4.5",
        "2.4.5rc1",
        "3.0.0rc1"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41016",
    "GHSA-x8mh-94wc-33gv"
  ],
  "details": "Apache Airflow\u0027s SMTP provider `SmtpHook` called Python\u0027s `smtplib.SMTP.starttls()` without an SSL context, so no certificate validation was performed on the TLS upgrade. A man-in-the-middle between the Airflow worker and the SMTP server could present a self-signed certificate, complete the STARTTLS upgrade, and capture the SMTP credentials sent during the subsequent `login()` call. Users are advised to upgrade to the `apache-airflow-providers-smtp` version that contains the fix.",
  "id": "PYSEC-2026-24",
  "modified": "2026-05-20T09:18:52.135285Z",
  "published": "2026-04-30T10:16:01.930Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://lists.apache.org/thread/gb202qy5r31bgdd3d51d7s5o1jh40kc4"
    },
    {
      "type": "FIX",
      "url": "https://github.com/apache/airflow/pull/65346"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-x8mh-94wc-33gv"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Action not permitted

GHSA-X8MH-94WC-33GV

CVE-2026-41016 (GCVE-0-2026-41016)

PYSEC-2026-24

Tags

Sightings

Nomenclature

Related by attack behaviour