CVE-2026-27024— pypdf has a possible infinite loop when processing TreeObject
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.
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 6.7.1之前版本存在安全漏洞，该漏洞源于处理特制PDF文件时访问TreeObject的子项，可能导致无限循环。
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-27024
Vulnerability Information
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Vulnerability Title
pypdf has a possible infinite loop when processing TreeObject
Source: CVE Program / CVE List V5
Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires accessing the children of a TreeObject, for example as part of outlines. This vulnerability is fixed in 6.7.1.
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:H/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 6.7.1之前版本存在安全漏洞，该漏洞源于处理特制PDF文件时访问TreeObject的子项，可能导致无限循环。
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-2026-27024
| # | POC Description | Source Link | Shenlong Link |
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Patches & Fixes for CVE-2026-27024 (1)
Same Patch Batch · py-pdf · 2026-02-20 · 3 CVEs total
| CVE-2026-27026 | pypdf possibly has long runtimes for malformed FlateDecode streams | |
| CVE-2026-27025 | pypdf has possible long runtimes/large memory usage for large /ToUnicode streams |
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V. Comments for CVE-2026-27024
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