Haraka affected by DoS via `__proto__` email header

{
  "id": "4b782a83c396cab434de8d2678831629cf1f315ad6a03aa68a85589f10ad2bba",
  "url": "https://osv.dev/vulnerability/CVE-2026-34752",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Haraka affected by DoS via `__proto__` email header",
    "summary": "Haraka is a Node.js mail server. Prior to version 3.1.4, sending an email with __proto__: as a header name crashes the Haraka worker process. This issue has been patched in version 3.1.4.",
    "evidence": "osv:CVE-2026-34752",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-34752",
      "aliases": [
        "CVE-2026-34752",
        "GHSA-xph3-r2jf-4vp3"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/haraka/haraka",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "a9c0fd522caa27f0ec704da29ab328b41f4dac0f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.1.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a9c0fd522caa27f0ec704da29ab328b41f4dac0f"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v3.1.4"
                  },
                  {
                    "cpe": "cpe:2.3:a:haraka_project:haraka:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.1.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.1.3",
            "v3.1.2",
            "v3.1.1",
            "v3.1.0",
            "v3.0.5",
            "3.0.4",
            "v3.0.3",
            "v3.0.2",
            "v3.0.1",
            "3.0.0",
            "2.8.28",
            "2.8.27",
            "2.8.26",
            "2.8.25",
            "2.8.24",
            "2.8.22",
            "release-2.8.21",
            "2.8.20",
            "v2.8.19",
            "2.8.18",
            "2.8.17",
            "2.8.16",
            "2.8.15",
            "v2.8.14",
            "2.8.13",
            "2.8.12",
            "2.8.11",
            "2.8.10",
            "v2.8.9",
            "v2.8.8",
            "v2.8.7",
            "v2.8.6",
            "v2.8.5",
            "v2.8.4",
            "v2.8.0",
            "v2.7.3",
            "v2.7.2",
            "v2.7.1",
            "v2.7.0",
            "v2.6.1",
            "v2.6.0",
            "v2.5.0",
            "v2.4.0",
            "v2.3.1",
            "v2.3.0",
            "v2.2.6",
            "v2.2.5",
            "v2.2.0",
            "v2.1.6",
            "v2.1.3",
            "v2.1.1",
            "v2.1.0",
            "v2.0.5",
            "v2.0.4",
            "v2.0.3",
            "v2.0.0",
            "v1.4.0",
            "v1.3.3",
            "v1.3.2",
            "v1.3.1",
            "v1.2.0",
            "v0.6.0",
            "v0.5.11",
            "v0.5.10",
            "v0.5.7",
            "v0.5.6",
            "v0.5.5",
            "v0.5.3",
            "v0.5.2",
            "v0.5",
            "v0.4",
            "v0.3",
            "v0.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34752.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.290416705Z",
      "provider": "osv",
      "references": [
        "https://github.com/haraka/Haraka/releases/tag/v3.1.4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34752.json",
        "https://github.com/haraka/Haraka/security/advisories/GHSA-xph3-r2jf-4vp3",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-34752"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-248"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34752.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-34752",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509021,
  "published_at": "2026-04-02T18:42:38.367+00:00"
}