CVE-2023-36807
mediumpypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files.
Vendor / product: Py-pdf — pypdf
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://github.com/py-pdf/pypdf/issues/1329 security-advisories@github.com
- https://github.com/py-pdf/pypdf/pull/1331 security-advisories@github.com
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55m security-advisories@github.com
- https://github.com/py-pdf/pypdf/issues/1329 af854a3a-2127-422b-91ae-364da2661108
- https://github.com/py-pdf/pypdf/pull/1331 af854a3a-2127-422b-91ae-364da2661108
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55m af854a3a-2127-422b-91ae-364da2661108