rclone serve s3 1.75.0 before 1.75.2 Memory Limit Bypass via Multipart Overflow

{
  "id": "ce51fdf5e7faebe3ef221f59f1f7b4c1843a092df5c337e6dba03a800464afa7",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116188",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "rclone serve s3 1.75.0 before 1.75.2 Memory Limit Bypass via Multipart Overflow",
    "summary": "rclone serve s3 versions 1.75.0 before 1.75.2 contain an integer overflow vulnerability in multipart reorder-memory accounting that bypasses the configured buffer limit. Attackers can open two concurrent current-part PUT requests declaring huge lengths to wrap the signed int64 counter and retain out-of-order parts in memory, exhausting the host.",
    "evidence": "cve:CVE-2026-116188",
    "products": [
      {
        "name": {
          "value": "rclone",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-116188",
      "aliases": [
        "CVE-2026-116188"
      ],
      "metrics": [
        {
          "format": "CVSS",
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 6.9,
            "attackVector": "NETWORK",
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "privilegesRequired": "NONE",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE"
          }
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 5.3,
            "attackVector": "NETWORK",
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "integrityImpact": "NONE",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "availabilityImpact": "LOW",
            "privilegesRequired": "NONE",
            "confidentialityImpact": "NONE"
          }
        }
      ],
      "affected": [
        {
          "vendor": "rclone",
          "product": "rclone",
          "versions": [
            {
              "status": "affected",
              "version": "1.75.0",
              "lessThan": "1.75.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "1.75.2",
              "versionType": "semver"
            }
          ],
          "packageURL": "pkg:golang/github.com/rclone/rclone",
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-25T13:20:24.506Z",
      "provider": "cve",
      "references": [
        "https://github.com/rclone/rclone/security/advisories/GHSA-qjw8-8hmp-c3m6",
        "https://www.vulncheck.com/advisories/rclone-serve-s3-1.75.0-before-1.75.2-memory-limit-bypass-via-multipart-overflow"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
          "shortName": "VulnCheck",
          "dateUpdated": "2026-10-25T13:20:24.506Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-116188",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 146795,
  "published_at": "2026-10-25T13:20:24.506+00:00"
}