Security advisory

{
  "id": "a8698123e362f47703716e25b95fa050d93fde69905b12b19d2be01eb8a8e27d",
  "url": "https://osv.dev/vulnerability/CVE-2021-26843",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-26843",
    "summary": "An issue was discovered in sthttpd through 2.27.1. On systems where the strcpy function is implemented with memcpy, the de_dotdot function may cause a Denial-of-Service (daemon crash) due to overlapping memory ranges being passed to memcpy. This can triggered with an HTTP GET request for a crafted filename. NOTE: this is similar to CVE-2017-10671, but occurs in a different part of the de_dotdot function.",
    "evidence": "osv:CVE-2021-26843",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-26843",
      "aliases": [
        "CVE-2021-26843"
      ],
      "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/blueness/sthttpd",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "2845bf5bff2b820d2336c8c8061cbfc5f271e720"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:sthttpd_project:sthttpd:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.27.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.27.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-26843.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:34.550471611Z",
      "provider": "osv",
      "references": [
        "https://github.com/blueness/sthttpd/issues/14"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-26843",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385627,
  "published_at": "2021-02-07T21:15:11.79+00:00"
}