HTTP::Body versions before 1.23_01 for Perl allow CPU exhaustion via quadratic rescanning of a multipart body with a missing or malformed boundary

{
  "id": "d5a93b70d30af8917b42e214bcaee0d813bd210d5121f8028938d85a1816d24a",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116133",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HTTP::Body versions before 1.23_01 for Perl allow CPU exhaustion via quadratic rescanning of a multipart body with a missing or malformed boundary",
    "summary": "HTTP::Body versions before 1.23_01 for Perl allow CPU exhaustion via quadratic rescanning of a multipart body with a missing or malformed boundary. Before the first part, and between parts, the multipart parser searches the whole buffered body for the next boundary. On a miss it keeps everything and searches again from the start when the next chunk arrives. A body with no boundary, or with a delimiter followed by neither CRLF nor \"--\", is therefore rescanned on every chunk, taking time quadratic in its size. A remote attacker can exhaust worker CPU with a few such requests.",
    "evidence": "cve:CVE-2026-116133",
    "products": [],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-116133",
      "aliases": [
        "CVE-2026-116133"
      ],
      "metrics": [],
      "affected": [
        {
          "repo": "https://github.com/libwww-perl/HTTP-Body",
          "modules": [
            "HTTP::Body"
          ],
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "1.23_01",
              "versionType": "custom"
            }
          ],
          "packageURL": "pkg:cpan/HTTP-Body",
          "packageName": "HTTP-Body",
          "programFiles": [
            "lib/HTTP/Body/MultiPart.pm"
          ],
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "HTTP::Body::MultiPart::parse_preamble"
            },
            {
              "name": "HTTP::Body::MultiPart::parse_boundary"
            }
          ]
        }
      ],
      "modified": "2026-10-28T17:15:16.522Z",
      "provider": "cve",
      "references": [
        "https://github.com/libwww-perl/HTTP-Body/commit/bf77eb959bbe1641b77f69eefe98d58ce4c4ec79.patch",
        "https://metacpan.org/release/GETTY/HTTP-Body-1.24/changes"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
          "shortName": "CPANSec",
          "dateUpdated": "2026-10-28T17:15:16.522Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-116133",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-cve",
  "document_id": 464407,
  "published_at": "2026-10-28T17:15:16.522+00:00"
}