CVE-2023-36807

Vulnerability 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. See GHSA-hm9v-vj3r-r55m for details.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• https://github.com/py-pdf/pypdf/issues/1329ExploitIssue TrackingVendor Advisory
• https://github.com/py-pdf/pypdf/pull/1331Patch
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55mExploitMitigationPatch
• https://github.com/py-pdf/pypdf/issues/1329ExploitIssue TrackingVendor Advisory
• https://github.com/py-pdf/pypdf/pull/1331Patch
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55mExploitMitigationPatch