{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "1.13.2"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0ad8a403a5c2eb13aacab92fffa6abc397157d10"
            }
          ],
          "repo": "https://github.com/php/frankenphp",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-4gfw-9v29-gp9h"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-200"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/128xxx/CVE-2026-128021.json"
  },
  "details": "FrankenPHP before 1.13.2 contains an information disclosure vulnerability that allows later clients to read earlier clients' libxml errors because worker mode never resets LIBXML(error_list) between requests. Attackers sending requests to the same worker thread can call libxml_get_errors() or libxml_get_last_error() to obtain other clients' parsed-document fragments and server filesystem paths.",
  "id": "CVE-2026-128021",
  "modified": "2026-11-14T02:31:08.572600498Z",
  "published": "2026-11-13T09:34:07.192Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/128xxx/CVE-2026-128021.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/php/frankenphp/security/advisories/GHSA-4gfw-9v29-gp9h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-128021"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/frankenphp-before-1.13.2-information-disclosure-via-libxml-error-state-in-worker-mode"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "FrankenPHP before 1.13.2 Information Disclosure via libxml Error State in Worker Mode"
}