pypdf — security advisory

{
  "id": "5ea9747a87b5cda8959cf4845231df22f62013dfe2c61330ebac4af7032c3db0",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-71870",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-71870",
    "summary": "pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause large memory consumption when pypdf/_cmap.py function parse_bfrange parses unusually large source-code or destination-string tokens in a font /ToUnicode CMap during text extraction. This issue is fixed in 6.15.0.",
    "evidence": "osv:UBUNTU-CVE-2026-71870",
    "products": [
      {
        "name": {
          "value": "pypdf",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "3.4.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.17.4-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.0.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.0.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.0.2-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "pypdf",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "6.9.2-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "6.9.2-2",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "pypdf",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "5.4.0-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "6.9.2-1",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "UBUNTU-CVE-2026-71870",
      "aliases": [
        "UBUNTU-CVE-2026-71870"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
        },
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "pypdf",
            "purl": "pkg:deb/ubuntu/pypdf?arch=source&distro=noble",
            "ecosystem": "Ubuntu:24.04:LTS"
          },
          "versions": [
            "3.4.1-1",
            "3.17.4-1",
            "4.0.0-1",
            "4.0.1-1",
            "4.0.2-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71870.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-pypdf",
                "binary_version": "4.0.2-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "pypdf",
            "purl": "pkg:deb/ubuntu/pypdf?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "6.9.2-1",
            "6.9.2-2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71870.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-pypdf",
                "binary_version": "6.9.2-2"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "pypdf",
            "purl": "pkg:deb/ubuntu/pypdf?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "5.4.0-1",
            "6.9.2-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71870.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-pypdf",
                "binary_version": "6.9.2-1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T13:00:47.006283349Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-71870"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-71870",
        "https://www.cve.org/CVERecord?id=CVE-2026-71870",
        "https://github.com/py-pdf/pypdf/commit/afba8080e19d29a3c256a742b340995e695b35aa",
        "https://github.com/py-pdf/pypdf/pull/3944",
        "https://github.com/py-pdf/pypdf/releases/tag/6.15.0",
        "https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3f-mc75-235c"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-71870",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 360831,
  "published_at": "2026-08-07T20:16:00+00:00"
}