CoAI through 4.0.0 Unauthenticated Path Traversal via Archive Download Endpoints

{
  "id": "d505932fb0eb9a820f88ab98ec5becd04108b93d4dcfc72c521a0f0b141dba2c",
  "url": "https://osv.dev/vulnerability/CVE-2026-111618",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CoAI through 4.0.0 Unauthenticated Path Traversal via Archive Download Endpoints",
    "summary": "CoAI (Chat Nio) through 4.0.0 contains an unauthenticated path traversal vulnerability in the generation and article archive download endpoints via the hash query parameter. Attackers can supply ../ sequences in hash to download any readable .tar.gz or .zip file, including other users' generated archives.",
    "evidence": "osv:CVE-2026-111618",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-111618",
      "aliases": [
        "CVE-2026-111618"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/coaidev/coai",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "e7df3f687b0a466eb396cd4f04686a3246b898c2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "4.0.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "4.0.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.0.0",
            "v3.11.1",
            "v3.10",
            "v3.9",
            "v3.8",
            "v3.7",
            "v3.6",
            "v3.5",
            "v3.4",
            "v3.3",
            "v3.2",
            "v3.1",
            "v3.0",
            "v2.1",
            "v2.0",
            "2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111618.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.304091724Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111618.json",
        "https://hackmd.io/@hieuPenguinnn/coai-chatnio-generation-article-download-path-traversal",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-111618",
        "https://www.vulncheck.com/advisories/coai-through-4.0.0-unauthenticated-path-traversal-via-archive-download-endpoints",
        "https://github.com/coaidev/coai",
        "https://github.com/coaidev/coai/blob/v4.0.0/addition/article/api.go#L25-L35",
        "https://github.com/coaidev/coai/blob/v4.0.0/addition/generation/api.go#L19-L29"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111618.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-111618",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513420,
  "published_at": "2026-10-16T17:38:55.985+00:00"
}