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CVE-2023-36807

6.2 · MEDIUM

pypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files.

Published Jun 30, 2023CWE-835EPSS 0.57%

Overview

CVE-2023-36807 is a medium-severity vulnerability. It was published on June 30, 2023 and has a CVSS 3.1 base score of 6.2 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.2, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/py-pdf/pypdf/issues/1329GitHubgithub.com/py-pdf/pypdf/pull/1331GitHubgithub.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55mGitHubgithub.com/py-pdf/pypdf/issues/1329GitHubgithub.com/py-pdf/pypdf/pull/1331GitHubgithub.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55m

How CyberStrike helps

Frequently asked questions

What is CVE-2023-36807?

CVE-2023-36807 is a medium-severity vulnerability. It was published on June 30, 2023 and has a CVSS 3.1 base score of 6.2 (MEDIUM).

How severe is CVE-2023-36807?

This vulnerability has a CVSS 3.1 base score of 6.2, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-36807?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-36807?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-36807 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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