{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.0.0-next.0"
                  },
                  {
                    "fixed": "3.1.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "introduced": "6.0.0-next.0"
                  },
                  {
                    "fixed": "6.0.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "2.70.4"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "introduced": "5.5.7"
                  },
                  {
                    "fixed": "5.5.8"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "04756a1f7a4f73e34f1934895340a46de84fc164"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "range": [
                  {
                    "fixed": "0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              }
            ]
          },
          "events": [
            {
              "introduced": "a77f5e9a515ff2cb14dece7ed2b0b8ad9e370b2f"
            },
            {
              "fixed": "4a75141ca7fab2ad70e472203c81adef0dea90a2"
            },
            {
              "fixed": "87da73e361070071b01fc459c5639d26baab34f5"
            },
            {
              "introduced": "0"
            },
            {
              "fixed": "70a5ad21c58266d3e08863b519d9485819b1a776"
            },
            {
              "introduced": "fef182780ecfc5eecd1c12e03afb99af9d1f7049"
            },
            {
              "fixed": "70a5ad21c58266d3e08863b519d9485819b1a776"
            },
            {
              "fixed": "04756a1f7a4f73e34f1934895340a46de84fc164"
            },
            {
              "fixed": "0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd"
            }
          ],
          "repo": "https://github.com/sveltejs/kit",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-rqw3-x7hx-mm3p"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-248"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/128xxx/CVE-2026-128123.json"
  },
  "details": "SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From version 5.5.7 until versions 5.5.8 and 6.0.1, , @sveltejs/adapter-node can attempt to add a header to an immutable request in a context that causes the server to crash, denying service to any other requests routed to that server. This issue is fixed in 5.5.8 and 6.0.1.",
  "id": "CVE-2026-128123",
  "modified": "2026-11-14T10:30:55.171593112Z",
  "published": "2026-11-13T19:54:05.381Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/128xxx/CVE-2026-128123.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/sveltejs/kit/commit/04756a1f7a4f73e34f1934895340a46de84fc164"
    },
    {
      "type": "FIX",
      "url": "https://github.com/sveltejs/kit/commit/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd"
    },
    {
      "type": "FIX",
      "url": "https://github.com/sveltejs/kit/pull/17620"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-node@5.5.8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-node@6.0.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/sveltejs/kit/security/advisories/GHSA-rqw3-x7hx-mm3p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-128123"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SvelteKit: `@sveltejs/adapter-node` crashes when proxying certain requests via `fetch`"
}