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CVE-2026-59935— pypdf: Possible infinite loop for not terminated inline images (ASCII85 and ASCIIHex filter)

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.

py-pdf pypdf是py-pdf组织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 6.14.2之前版本存在资源管理错误漏洞，该漏洞源于包含未终止的内联图像页面内容流使用ASCII85或ASCIIHex过滤器，可能导致解析时无限循环。

AI Predicted 7.5 Difficulty: Easy EPSS 0.62% · P48

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
py-pdf pypdf < 6.14.2 affected
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I. Basic Information for CVE-2026-59935

Vulnerability Information
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Vulnerability Title
pypdf: Possible infinite loop for not terminated inline images (ASCII85 and ASCIIHex filter)
Source: CVE Program / CVE List V5
Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.14.2, an attacker can craft a PDF with a page content stream containing a not terminated inline image that uses the ASCII85 or ASCIIHex filters, causing an infinite loop during parsing such as when extracting page text. This issue is fixed in version 6.14.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/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 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
py-pdf pypdf是py-pdf组织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 6.14.2之前版本存在资源管理错误漏洞，该漏洞源于包含未终止的内联图像页面内容流使用ASCII85或ASCIIHex过滤器，可能导致解析时无限循环。
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

Vendor Product Affected Versions CPE Subscribe
py-pdf pypdf < 6.14.2 -

II. Public POCs for CVE-2026-59935

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III. Intelligence Information for CVE-2026-59935

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Patches & Fixes for CVE-2026-59935 (2)

Other References for CVE-2026-59935 (2)

Same Patch Batch · py-pdf · 2026-07-08 · 4 CVEs total

CVE-2026-59938 pypdf: Possible large memory usage for wrong image dimensions
CVE-2026-59937 pypdf: Possible long runtimes for repeated malformed cross-reference entries
CVE-2026-59936 pypdf: Possible infinite loop for not terminated inline images

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-59935

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