Incorrect signature verification in django-ses

{
  "id": "1b8ae4415520d628d8f3fb8af154d7e2e3243416af5a2833538e5463f0a536cc",
  "url": "https://osv.dev/vulnerability/CVE-2023-33185",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Incorrect signature verification in django-ses",
    "summary": "Django-SES is a drop-in mail backend for Django. The django_ses library implements a mail backend for Django using AWS Simple Email Service. The library exports the `SESEventWebhookView class` intended to receive signed requests from AWS to handle email bounces, subscriptions, etc. These requests are signed by AWS and are verified by django_ses, however the verification of this signature was found to be flawed as it allowed users to specify arbitrary public certificates. This issue was patched in version 3.5.0.",
    "evidence": "osv:CVE-2023-33185",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-33185",
      "aliases": [
        "CVE-2023-33185",
        "GHSA-qg36-9jxh-fj25",
        "PYSEC-2023-82"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/django-ses/django-ses",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2388f4b8c644ae8d26e5457af00e2974a17d0995"
                },
                {
                  "fixed": "b71b5f413293a13997b6e6314086cb9c22629795"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:django-ses_project:django-ses:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.5.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "b71b5f413293a13997b6e6314086cb9c22629795"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.4.1",
            "v3.4.0",
            "v3.2.2",
            "v3.2.1",
            "v3.2.0",
            "v3.1.2",
            "v3.1.0",
            "v3.0.1",
            "v2.6.1",
            "v2.6.0",
            "v2.5.0",
            "v2.4.0",
            "v2.3.1",
            "v2.3.0",
            "v2.2.2",
            "v2.2.1",
            "v2.2.0",
            "v2.1.1",
            "v2.1.0",
            "v2.0.0",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0",
            "v0.8.14",
            "v0.8.13",
            "v0.8.12",
            "v0.8.11",
            "v0.8.10",
            "v0.8.8",
            "v0.8.7",
            "v0.8.6",
            "v0.8.5",
            "v0.8.4",
            "v0.8.3.1",
            "v0.8.3",
            "v0.8.2",
            "0.8.1",
            "v0.8.0",
            "v0.7.1",
            "v0.7.0",
            "v0.6.0",
            "v0.4.0",
            "v0.3.0",
            "v0.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-33185.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.060555468Z",
      "provider": "osv",
      "references": [
        "https://github.com/django-ses/django-ses/blob/3d627067935876487f9938310d5e1fbb249a7778/CVE/001-cert-url-signature-verification.md",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/33xxx/CVE-2023-33185.json",
        "https://github.com/django-ses/django-ses/security/advisories/GHSA-qg36-9jxh-fj25",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-33185",
        "https://github.com/django-ses/django-ses/commit/b71b5f413293a13997b6e6314086cb9c22629795"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-347"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/33xxx/CVE-2023-33185.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-33185",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517363,
  "published_at": "2023-05-26T20:03:33.725+00:00"
}