ALOS HTTP: Unauthenticated remote DoS: malformed path starting with "?" triggers out-of-bounds panic in sanitizeRequestPath, crashing entire server

{
  "id": "fb76babe7a4689d7114d86a0e93d1e15b0b2928a8abacacdb98569a8b0e2fe43",
  "url": "https://osv.dev/vulnerability/CVE-2026-55484",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ALOS HTTP: Unauthenticated remote DoS: malformed path starting with \"?\" triggers out-of-bounds panic in sanitizeRequestPath, crashing entire server",
    "summary": "ALOS HTTP is a Linux-first Go web framework and application server built around a custom networking stack. Prior to 0.0.0-20260617230736-314b6783e196, core/utils.go::sanitizeRequestPath calls splitPathQuery on a request path beginning with a question mark and then performs the unchecked p[0] access without checking whether the resulting path is empty. An unauthenticated client can send a malformed request such as a question-mark-only path through h1_plain.go::ParseH1RequestHead, hpack.go::decodeSimpleGetPathHTTPSRequest, hpack.go::observeHeader, or h3_conn.go::handleRequestStream, causing an out-of-bounds panic before core.Recovery() middleware runs and terminating the server process. This issue is fixed in pseudo-version 0.0.0-20260617230736-314b6783e196.",
    "evidence": "osv:CVE-2026-55484",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-55484",
      "aliases": [
        "CVE-2026-55484",
        "GHSA-hr6j-w4mw-g9mj",
        "GO-2026-6321"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/guno1928/alos-http",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "314b6783e19698c85ea9d9b197ff52f7f6a3a374"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "314b6783e19698c85ea9d9b197ff52f7f6a3a374"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55484.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.252204262Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55484.json",
        "https://github.com/guno1928/alos-http/security/advisories/GHSA-hr6j-w4mw-g9mj",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-55484",
        "https://github.com/guno1928/alos-http/commit/314b6783e19698c85ea9d9b197ff52f7f6a3a374"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-248",
          "CWE-754"
        ],
        "cna_assigner": "GitHub_M",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "0.0.0-20260617230736-314b6783e196"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "0.0.0-20260617230736-314b6783e196"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55484.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-55484",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507592,
  "published_at": "2026-08-28T19:19:19.749+00:00"
}