{"id":"UBUNTU-CVE-2023-36807","details":"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. See GHSA-hm9v-vj3r-r55m for details.","modified":"2025-07-16T07:46:08.128122Z","published":"2023-06-30T19:15:00Z","withdrawn":"2025-07-18T16:54:32Z","upstream":["CVE-2023-36807"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-36807"},{"type":"REPORT","url":"https://github.com/py-pdf/pypdf/pull/1331"},{"type":"REPORT","url":"https://github.com/py-pdf/pypdf/issues/1329"},{"type":"REPORT","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55m"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-36807"}],"affected":[{"package":{"name":"pypdf2","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/pypdf2@1.25.1-1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.25.1-1"}]}],"versions":["1.23+git20141008-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"python-pypdf2","binary_version":"1.25.1-1"},{"binary_name":"python3-pypdf2","binary_version":"1.25.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36807.json"}},{"package":{"name":"pypdf2","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/pypdf2@1.25.1-1ubuntu0.1~esm2?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.25.1-1ubuntu0.1~esm2"}]}],"versions":["1.23+git20141008-1","1.25.1-1","1.25.1-1ubuntu0.1~esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"python-pypdf2","binary_version":"1.25.1-1ubuntu0.1~esm2"},{"binary_name":"python3-pypdf2","binary_version":"1.25.1-1ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36807.json"}},{"package":{"name":"pypdf2","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/pypdf2@1.26.0-2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.26.0-2"}]}],"ecosystem_specific":{"binaries":[{"binary_name":"python-pypdf2","binary_version":"1.26.0-2"},{"binary_name":"python3-pypdf2","binary_version":"1.26.0-2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36807.json"}},{"package":{"name":"pypdf2","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/pypdf2@1.26.0-2ubuntu0.1~esm2?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.26.0-2ubuntu0.1~esm2"}]}],"versions":["1.26.0-2","1.26.0-2ubuntu0.1~esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"python-pypdf2","binary_version":"1.26.0-2ubuntu0.1~esm2"},{"binary_name":"python3-pypdf2","binary_version":"1.26.0-2ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36807.json"}},{"package":{"name":"pypdf2","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/pypdf2@1.26.0-3ubuntu1.20.04.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.26.0-3ubuntu1.20.04.1"}]}],"versions":["1.26.0-2","1.26.0-3ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"python-pypdf2","binary_version":"1.26.0-3ubuntu1.20.04.1"},{"binary_name":"python3-pypdf2","binary_version":"1.26.0-3ubuntu1.20.04.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36807.json"}},{"package":{"name":"pypdf2","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/pypdf2@1.26.0-4ubuntu0.22.04.1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.26.0-4ubuntu0.22.04.1"}]}],"versions":["1.26.0-4"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"python3-pypdf2","binary_version":"1.26.0-4ubuntu0.22.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36807.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}