Manipulated RunLengthDecode streams can exhaust RAM

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-28351",
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "dateUpdated": "2026-02-27T20:59:16.839Z",
    "dateReserved": "2026-02-26T18:38:13.890Z",
    "datePublished": "2026-02-27T20:59:16.839Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M",
        "dateUpdated": "2026-02-27T20:59:16.839Z"
      },
      "title": "Manipulated RunLengthDecode streams can exhaust RAM",
      "descriptions": [
        {
          "lang": "en",
          "value": "pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. This has been fixed in pypdf 6.7.4. As a workaround, consider applying the changes from PR #3664."
        }
      ],
      "affected": [
        {
          "vendor": "py-pdf",
          "product": "pypdf",
          "versions": [
            {
              "version": "< 6.7.4",
              "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-f2v5-7jq9-h8cg",
          "name": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cg",
          "tags": [
            "x_refsource_CONFIRM"
          ]
        },
        {
          "url": "https://github.com/py-pdf/pypdf/pull/3664",
          "name": "https://github.com/py-pdf/pypdf/pull/3664",
          "tags": [
            "x_refsource_MISC"
          ]
        },
        {
          "url": "https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858",
          "name": "https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858",
          "tags": [
            "x_refsource_MISC"
          ]
        },
        {
          "url": "https://github.com/py-pdf/pypdf/releases/tag/6.7.4",
          "name": "https://github.com/py-pdf/pypdf/releases/tag/6.7.4",
          "tags": [
            "x_refsource_MISC"
          ]
        }
      ],
      "metrics": [
        {}
      ]
    }
  }
}