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CVE-2023-36810— Quadratic runtime with malformed PDF missing xref marker 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 1.27.9之前版本存在安全漏洞，该漏洞源于攻击者可以制PDF导致意外的长时间运行，会阻塞进程。

CVSS 6.2 · Medium EPSS 0.63% · P48

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2023-36810

Vulnerability Information
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Vulnerability Title
Quadratic runtime with malformed PDF missing xref marker 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. An attacker who uses this vulnerability can craft a PDF which leads to unexpected long runtime. This quadratic runtime blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. This issue has been addressed in PR 808 and versions from 1.27.9 include this fix. Users are advised to upgrade. There are no known workarounds for this vulnerability.
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
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
pypdf 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 1.27.9之前版本存在安全漏洞，该漏洞源于攻击者可以制PDF导致意外的长时间运行，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 < 1.27.9 -

II. Public POCs for CVE-2023-36810

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III. Intelligence Information for CVE-2023-36810

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Patches & Fixes for CVE-2023-36810 (1)

Vendor Advisories for CVE-2023-36810 (1)

Mailing List Discussions for CVE-2023-36810 (1)

Other References for CVE-2023-36810 (1)

IV. Related Vulnerabilities

Same product: pypdf
Same vendor: py-pdf
Same weakness: CWE-407

V. Comments for CVE-2023-36810

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