{"api_version":"1","generated_at":"2026-04-17T12:03:39+00:00","cve":"CVE-2023-36807","urls":{"html":"https://cve.report/CVE-2023-36807","api":"https://cve.report/api/cve/CVE-2023-36807.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-36807","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-36807"},"summary":{"title":"CVE-2023-36807","description":"pypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. In version 2.10.5 an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. That is, for example, the case if the user extracted metadata from such a malformed PDF. Versions prior to 2.10.5 throw an error, but do not hang forever. This issue was fixed with https://github.com/py-pdf/pypdf/pull/1331 which has been included in release 2.10.6. Users are advised to upgrade. Users unable to upgrade should modify `PyPDF2/generic/_data_structures.py::read_object` to an an error throwing case. 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