{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "11.2.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "85db3be5d0096859b810f0e8d3e151d5dc9b948f"
            },
            {
              "fixed": "d358d82cbcb269d764a2deb598a37043bd054f45"
            }
          ],
          "repo": "https://github.com/gchq/cyberchef",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-fx6f-382r-j72c"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1321",
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57439.json"
  },
  "details": "CyberChef is a web app for encryption, encoding, compression, and data analysis. Prior to 11.2.0, the Series Chart operation accepts __proto__ as a key while parsing user-supplied CSV, allowing prototype pollution that can be chained with operations such as Parse UDP to inject malicious JavaScript into HTML output. This issue is fixed in version 11.2.0.",
  "id": "CVE-2026-57439",
  "modified": "2026-08-07T11:31:22.463383917Z",
  "published": "2026-07-08T14:58:38.693Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gchq/CyberChef/releases/tag/v11.2.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57439.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-57439"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gchq/CyberChef/issues/2568"
    },
    {
      "type": "FIX",
      "url": "https://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f"
    },
    {
      "type": "FIX",
      "url": "https://github.com/gchq/CyberChef/pull/2569"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "CyberChef: Prototype pollution in Series Chart operation"
}