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CVE-2023-36807— Infinite Loop when reading malformed objects in pypdf

Quick assessment

Affected
py-pdf pypdf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PyPDF2是一个免费的开源纯 python PDF 库。能够拆分、 合并、 裁剪和转换 PDF 文件的页面。 pypdf 2.10.6之前版本存在安全漏洞，该漏洞源于存在无限循环，会阻塞进程。

CVSS 6.2 · Medium EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2023-36807

Vulnerability Information
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Vulnerability Title
Infinite Loop when reading malformed objects in pypdf
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
PyPDF2 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PyPDF2是一个免费的开源纯 python PDF 库。能够拆分、 合并、 裁剪和转换 PDF 文件的页面。 pypdf 2.10.6之前版本存在安全漏洞，该漏洞源于存在无限循环，会阻塞进程。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
py-pdf pypdf 2.10.5 -

II. Public POCs for CVE-2023-36807

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III. Intelligence Information for CVE-2023-36807

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Patches & Fixes for CVE-2023-36807 (1)

Vendor Advisories for CVE-2023-36807 (1)

Other References for CVE-2023-36807 (1)

IV. Related Vulnerabilities

Same product: pypdf
Same vendor: py-pdf
Same weakness: CWE-835

V. Comments for CVE-2023-36807

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