{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0e5157c2d9440c3594de43ffe27745eb474a2fb9"
            }
          ],
          "repo": "https://github.com/py-pdf/pypdf",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-qpxp-75px-xjcp"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-400",
      "CWE-407"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33123.json"
  },
  "details": "pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.",
  "id": "CVE-2026-33123",
  "modified": "2026-04-01T23:08:32.822375818Z",
  "published": "2026-03-20T09:09:12.831Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/releases/tag/6.9.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33123.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33123"
    },
    {
      "type": "FIX",
      "url": "https://github.com/py-pdf/pypdf/pull/3686"
    }
  ],
  "schema_version": "1.7.3",
  "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 has inefficient decoding of array-based streams"
}