{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.6.0"
              },
              {
                "last_affected": "5.1.5"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "3d99fc17081aa43463e715cf1e180abf47e12fb4"
            },
            {
              "last_affected": "c201760cccb84c61f70d16baca26e1e548eb1157"
            }
          ],
          "repo": "https://github.com/shlinkio/shlink",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18736.json"
  },
  "details": "Shlink contains a server-side request forgery vulnerability that allows authenticated API key holders to cause the server to issue arbitrary HTTP GET requests by supplying a crafted long URL during short URL creation with title auto-resolution enabled. Attackers can submit URLs pointing to public hosts that redirect to internal targets, including loopback addresses, link-local ranges, and cloud metadata endpoints such as 169.254.169.254, to exfiltrate internal service information via the HTML title element returned in the short URL creation response.",
  "id": "CVE-2026-18736",
  "modified": "2026-08-06T03:31:06.692094999Z",
  "published": "2026-08-03T20:15:22.814Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18736.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/theopaid/Server-side-request-forgery-through-short-URL-title-resolution-shlink-"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18736"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/shlink-server-side-request-forgery-via-short-url-title-auto-resolution"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/shlinkio/shlink"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Shlink Server-Side Request Forgery via Short URL Title Auto-Resolution"
}