{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.3.3"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "df90c3b93e51faef68891d97b626544f619c5b31"
            },
            {
              "fixed": "4b02e8c5c2a873b638a4d90bd8459213ba323724"
            }
          ],
          "repo": "https://github.com/locize/gettext-converter",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-f4jp-rw7w-ccwg"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1321"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55451.json"
  },
  "details": "gettext-converter provides gettext resource conversion utilities for JavaScript. Prior to 1.3.3, js2i18next() in lib/js2i18next.js splits nested translation keys using options.keyseparator, whose default value consists of two number signs, and uses each segment as a dynamic object key without rejecting __proto__, constructor, or prototype. When an application converts untrusted PO or i18next translation data, a __proto__ segment resolves Object.prototype as the nested write target and Object.assign writes attacker-controlled translated properties onto the process-wide prototype. The resulting prototype pollution can cause denial of service and may enable application-dependent follow-on attacks. This issue is fixed in version 1.3.3.",
  "id": "CVE-2026-55451",
  "modified": "2026-09-16T03:30:57.147268101Z",
  "published": "2026-09-14T16:49:36.238Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/locize/gettext-converter/releases/tag/v1.3.3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55451.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/locize/gettext-converter/security/advisories/GHSA-f4jp-rw7w-ccwg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55451"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/locize/gettext-converter/issues/15"
    },
    {
      "type": "FIX",
      "url": "https://github.com/locize/gettext-converter/commit/df90c3b93e51faef68891d97b626544f619c5b31"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "gettext-converter: Prototype pollution in js2i18next() via crafted translation keys"
}