CVE-2023-36807

low-risk
Published 2023-06-30

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.

Do I need to act?

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0.09% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.2/10 Medium
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Pypdf Project

References (6)

Exploit https://github.com/py-pdf/pypdf/issues/1329
Patch https://github.com/py-pdf/pypdf/pull/1331
Exploit https://github.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55m
Exploit https://github.com/py-pdf/pypdf/issues/1329
Patch https://github.com/py-pdf/pypdf/pull/1331
Exploit https://github.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55m
25
/ 100
low-risk
Severity 20/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal