SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization

{
  "id": "f697bd7da82074a70cfc030820bf5b6f9490994c961e49166a700477e155a05a",
  "url": "https://osv.dev/vulnerability/CVE-2026-82261",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization",
    "summary": "SvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.",
    "evidence": "osv:CVE-2026-82261",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-82261",
      "aliases": [
        "CVE-2026-82261",
        "GHSA-88qp-p4qg-rqm6"
      ],
      "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/sveltejs/kit",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ab3784911accefd8d3bc292a80d8e3b825528fd3"
                },
                {
                  "fixed": "9c4a73733441acaa2f166d023fcdb977a9d88cf6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.52.2"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "cpe": "cpe:2.3:a:svelte:sveltekit:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "2.49.0"
                      },
                      {
                        "fixed": "2.52.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "@sveltejs/kit@2.52.0",
            "@sveltejs/adapter-auto@7.0.1",
            "@sveltejs/enhanced-img@0.10.2",
            "@sveltejs/kit@2.51.0",
            "@sveltejs/enhanced-img@0.10.1",
            "@sveltejs/adapter-node@5.5.3",
            "@sveltejs/adapter-netlify@6.0.0",
            "@sveltejs/adapter-cloudflare@7.2.7",
            "@sveltejs/kit@2.50.2",
            "@sveltejs/enhanced-img@0.10.0",
            "@sveltejs/kit@2.50.1",
            "@sveltejs/adapter-vercel@6.3.1",
            "@sveltejs/adapter-node@5.5.2",
            "@sveltejs/adapter-cloudflare@7.2.6",
            "@sveltejs/kit@2.50.0",
            "@sveltejs/enhanced-img@0.9.3",
            "@sveltejs/kit@2.49.5",
            "@sveltejs/adapter-node@5.5.1",
            "@sveltejs/adapter-cloudflare@7.2.5",
            "@sveltejs/adapter-node@5.5.0",
            "@sveltejs/kit@2.49.4",
            "@sveltejs/kit@2.49.3",
            "@sveltejs/adapter-vercel@6.3.0",
            "@sveltejs/kit@2.49.2",
            "@sveltejs/kit@2.49.1",
            "@sveltejs/package@2.5.7",
            "@sveltejs/enhanced-img@0.9.2",
            "@sveltejs/adapter-vercel@6.2.0",
            "@sveltejs/enhanced-img@0.9.1",
            "@sveltejs/kit@2.49.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82261.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.357370724Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82261.json",
        "https://github.com/sveltejs/kit/security/advisories/GHSA-88qp-p4qg-rqm6",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-82261",
        "https://www.vulncheck.com/advisories/sveltekit-before-2.52.2-cpu-exhaustion-via-remote-form-deserialization"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400"
        ],
        "cna_assigner": "VulnCheck",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "2.49.0"
                  },
                  {
                    "fixed": "2.52.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "2.49.0"
                  },
                  {
                    "fixed": "2.52.1"
                  }
                ],
                "source": "CPE_FIELD",
                "strategy": "CPEApplicability"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82261.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-82261",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499579,
  "published_at": "2026-08-28T10:49:44.323+00:00"
}