If LimitXMLRequestBody is set to allow request bodies larger than 350MB (defaults to 1M) on 32 bit systems an integer overflow happens which later causes out of bounds writes

{
  "id": "8bb988591a168b860d3191ef1938d3f41bb6650a9a451816ced8d4a231322522",
  "url": "https://osv.dev/vulnerability/CLEANSTART-2026-UC87477",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "If LimitXMLRequestBody is set to allow request bodies larger than 350MB (defaults to 1M) on 32 bit systems an integer overflow happens which later causes out of bounds writes",
    "summary": "Security vulnerability affects the apache2 package. If LimitXMLRequestBody is set to allow request bodies larger than 350MB (defaults to 1M) on 32 bit systems an integer overflow happens which later causes out of bounds writes.",
    "evidence": "osv:CLEANSTART-2026-UC87477",
    "products": [
      {
        "name": {
          "value": "apache2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.4.53-r0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CLEANSTART-2026-UC87477",
      "aliases": [
        "CLEANSTART-2026-UC87477"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.4.53-r0"
                }
              ]
            }
          ],
          "package": {
            "name": "apache2",
            "purl": "pkg:apk/cleanstart/apache2",
            "ecosystem": "CleanStart"
          },
          "database_specific": {
            "source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-UC87477.json"
          }
        }
      ],
      "modified": "2026-10-09T01:00:22.781829078Z",
      "provider": "osv",
      "upstream": [
        "CVE-2022-22721"
      ],
      "references": [
        "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-UC87477.json",
        "https://osv.dev/vulnerability/CVE-2022-22721",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-22721"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2022-22721",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 108214,
  "published_at": "2026-10-09T00:49:53.242+00:00"
}