{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.0.10"
              },
              {
                "fixed": "2.3.3"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "43624792a3ddcf11e8cc5fcd4538fa28cae36fc8"
            },
            {
              "fixed": "71d43c6a6e2c57784b1f744787bb6ee3475f3cbb"
            }
          ],
          "repo": "https://github.com/nezhahq/nezha",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-jr2j-7hvh-h4q9"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101087.json"
  },
  "details": "Nezha versions 2.0.10 through 2.3.2 use a restricted HTTP client to validate user-configurable notification and DDNS webhook URLs, but the denylist did not cover IPv6 transition ranges — specifically the 6to4 prefix 2002::/16 and the local-use IPv4/IPv6 translation prefix 64:ff9b:1::/48. Because such addresses satisfy Go's netip.Addr.IsGlobalUnicast check, the URL validator accepted them. An authenticated user able to configure a webhook may be able to cause the dashboard to issue requests to an otherwise restricted IPv6 endpoint, but only where the dashboard's network provides unusual or non-standards-compliant routing for these transition ranges; no direct path to an IPv4 metadata, loopback, or private-network HTTP request has been demonstrated. The issue is fixed in version 2.3.3 (commit d1fcde8e), which blocks both prefixes.",
  "id": "CVE-2026-101087",
  "modified": "2026-09-29T03:31:03.886362363Z",
  "published": "2026-09-27T20:49:58.749Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101087.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/nezhahq/nezha/security/advisories/GHSA-jr2j-7hvh-h4q9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-101087"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/nezha-2.0.10-through-2.3.2-ssrf-denylist-bypass-ipv6"
    },
    {
      "type": "FIX",
      "url": "https://github.com/nezhahq/nezha/commit/d1fcde8e"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Nezha 2.0.10 through 2.3.2 SSRF Denylist Bypass IPv6"
}