{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "6.12.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "08eb1435ef2e4d1e3d5fe90636c3cee7aa6f4470"
            }
          ],
          "repo": "https://github.com/py-pdf/pypdf",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-248m-82v9-q6g6"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-834"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48156.json"
  },
  "details": "pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.",
  "id": "CVE-2026-48156",
  "modified": "2026-07-08T05:37:17.613576763Z",
  "published": "2026-05-28T14:50:41.829Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/releases/tag/6.12.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48156.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48156"
    },
    {
      "type": "FIX",
      "url": "https://github.com/py-pdf/pypdf/pull/3791"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pypdf: Possible long runtimes for zero-only width values in cross-reference streams"
}