CVE-2026-24688— pypdf has possible Infinite Loop when processing outlines/bookmarks
Quick assessment
Affected
py-pdf pypdf
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
pypdf是py-pdf开源的一个免费开源的纯 python PDF 库。能够拆分、合并、裁剪和转换 PDF 文件的页面。 pypdf 6.6.2之前版本存在安全漏洞，该漏洞源于存在无限循环，可能导致处理特制PDF时消耗资源。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-24688
Vulnerability Information
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Vulnerability Title
pypdf has possible Infinite Loop when processing outlines/bookmarks
Source: CVE Program / CVE List V5
Vulnerability Description
pypdf is a free and open-source pure-python PDF library. An attacker who uses an infinite loop vulnerability that is present in versions prior to 6.6.2 can craft a PDF which leads to an infinite loop. This requires accessing the outlines/bookmarks. This has been fixed in pypdf 6.6.2. If projects cannot upgrade yet, consider applying the changes from PR #3610 manually.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
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
pypdf 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
pypdf是py-pdf开源的一个免费开源的纯 python PDF 库。能够拆分、合并、裁剪和转换 PDF 文件的页面。 pypdf 6.6.2之前版本存在安全漏洞，该漏洞源于存在无限循环，可能导致处理特制PDF时消耗资源。
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
II. Public POCs for CVE-2026-24688
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | CVE-2026-24688 - pypdf - DoS - POC | https://github.com/JoakimBulow/CVE-2026-24688 | POC Details |
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Patches & Fixes for CVE-2026-24688 (1)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-24688
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