{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "6.19.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0d8b5a8832cde1ba308b5c27567b879b7b7eed4a"
            },
            {
              "fixed": "d62cb58d3988b291b0435eddfd118c4f8f6b6a46"
            }
          ],
          "repo": "https://github.com/py-pdf/pypdf",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-w23x-9jrw-r45c"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103000.json"
  },
  "details": "pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/_page_labels.py to generate strings beyond a reasonable page-label length when an application retrieves document page labels, consuming excessive memory and potentially making the application unavailable. This issue is fixed in version 6.19.0.",
  "id": "CVE-2026-103000",
  "modified": "2026-10-02T03:31:11.999077131Z",
  "published": "2026-09-30T20:13:00.379Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/releases/tag/6.19.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103000.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-w23x-9jrw-r45c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103000"
    },
    {
      "type": "FIX",
      "url": "https://github.com/py-pdf/pypdf/commit/0d8b5a8832cde1ba308b5c27567b879b7b7eed4a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/py-pdf/pypdf/pull/4096"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pypdf: Possible large memory usage when retrieving alphabetical page labels"
}