{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "5.7.12"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8114a1d4cfbcaab4c1c337d921597805d71dee3b"
            },
            {
              "fixed": "fef9bae63da1afc0518d32e3333db20f409ab196"
            }
          ],
          "repo": "https://github.com/gravitlauncher/launcher",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-5g75-477j-2c2f"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-200",
      "CWE-22",
      "CWE-522"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54617.json"
  },
  "details": "GravitLauncher is an open-source Minecraft launcher based on sashok724's v3. Prior to 5.7.12, an unauthenticated remote actor can send a raw HTTP request target without a leading slash to the default LaunchServer file server on port 9274. FileServerHandler.channelRead0 in components/launchserver/src/main/java/pro/gravit/launchserver/socket/handlers/fileserver/FileServerHandler.java strips the first request-target character and resolves the remaining path against updatesDir without re-normalizing and verifying containment. This leaves parent-directory components in a no-leading-slash request and allows reading any file accessible to the LaunchServer process, including .keys/ecdsa_id, .keys/legacySalt, and LaunchServer.json. Disclosure of those files can expose signing keys, refresh-token material, and database credentials, enabling forged administrative access tokens and full authentication bypass. A normalizing L7 proxy may block the primary request form, but direct exposure and L4/TCP proxies remain affected, and netty.fileServerEnabled is enabled by default. This issue is fixed in 5.7.12.",
  "id": "CVE-2026-54617",
  "modified": "2026-09-19T03:30:57.460318548Z",
  "published": "2026-09-17T18:34:40.563Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/GravitLauncher/Launcher/releases/tag/v5.7.12"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54617.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/GravitLauncher/Launcher/security/advisories/GHSA-5g75-477j-2c2f"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54617"
    },
    {
      "type": "FIX",
      "url": "https://github.com/GravitLauncher/Launcher/commit/8114a1d4cfbcaab4c1c337d921597805d71dee3b"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "GravitLauncher: Unauthenticated path traversal in LaunchServer FileServerHandler"
}