MIME::Parser versions before 5.521 for Perl set no limit on the number of message parts by default, allowing memory exhaustion

{
  "id": "5cfde897a5bdd507602aa21af76fd9856c6821e0019a04bbbef097e993e4e619",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116273",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MIME::Parser versions before 5.521 for Perl set no limit on the number of message parts by default, allowing memory exhaustion",
    "summary": "MIME::Parser versions before 5.521 for Perl set no limit on the number of message parts by default, allowing memory exhaustion. The max_parts option defaulted to -1, which disables the limit, so a parser created with default settings builds an entity for every part however many a message has. Version 5.521 sets max_parts to 1000 and max_depth to 64 by default. Setting either to -1 still removes the limit.",
    "evidence": "cve:CVE-2026-116273",
    "products": [],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-116273",
      "aliases": [
        "CVE-2026-116273"
      ],
      "metrics": [],
      "affected": [
        {
          "repo": "https://salsa.debian.org/dskoll/mime-tools",
          "modules": [
            "MIME::Parser"
          ],
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "5.521",
              "versionType": "custom"
            }
          ],
          "packageURL": "pkg:cpan/MIME-tools",
          "packageName": "MIME-tools",
          "programFiles": [
            "lib/MIME/Parser.pm"
          ],
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "MIME::Parser::init"
            },
            {
              "name": "MIME::Parser::process_part"
            }
          ]
        }
      ],
      "modified": "2026-10-28T17:34:44.660Z",
      "provider": "cve",
      "references": [
        "https://metacpan.org/release/DSKOLL/MIME-tools-5.521/changes"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
          "shortName": "CPANSec",
          "dateUpdated": "2026-10-28T17:34:44.660Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-116273",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-cve",
  "document_id": 466449,
  "published_at": "2026-10-28T17:34:44.66+00:00"
}