pypdf: Possible large memory usage for large offsets for layout mode text

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-48155",
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "dateUpdated": "2026-05-28T15:57:54.367Z",
    "dateReserved": "2026-05-20T23:12:43.031Z",
    "datePublished": "2026-05-28T14:51:49.411Z",
    "state": "PUBLISHED"
  },
  "containers": {
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M",
        "dateUpdated": "2026-05-28T14:51:49.411Z"
      },
      "title": "pypdf: Possible large memory usage for large offsets for layout mode text",
      "descriptions": [
        {
          "lang": "en",
          "value": "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 large memory usage. This requires extracting text in layout mode with large character offsets. This vulnerability is fixed in 6.12.0."
        }
      ],
      "affected": [
        {
          "vendor": "py-pdf",
          "product": "pypdf",
          "versions": [
            {
              "version": "< 6.12.0",
              "status": "affected"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "cweId": "CWE-400",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-cj93-chg6-vgv8",
          "name": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-cj93-chg6-vgv8",
          "tags": [
            "x_refsource_CONFIRM"
          ]
        },
        {
          "url": "https://github.com/py-pdf/pypdf/pull/3790",
          "name": "https://github.com/py-pdf/pypdf/pull/3790",
          "tags": [
            "x_refsource_MISC"
          ]
        },
        {
          "url": "https://github.com/py-pdf/pypdf/releases/tag/6.12.0",
          "name": "https://github.com/py-pdf/pypdf/releases/tag/6.12.0",
          "tags": [
            "x_refsource_MISC"
          ]
        }
      ],
      "metrics": [
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    },
    "adp": [
      {
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          "shortName": "CISA-ADP",
          "dateUpdated": "2026-05-28T15:57:54.367Z"
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        "title": "CISA ADP Vulnrichment",
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}