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CVE-2026-59937— pypdf: Possible long runtimes for repeated malformed cross-reference entries

AI Predicted 5.3 Difficulty: Easy EPSS 0.34% · P27

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProductVersion RangeStatus
py-pdfpypdf< 6.14.0affected
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I. Basic Information for CVE-2026-59937

Vulnerability Information
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Vulnerability Title
pypdf: Possible long runtimes for repeated malformed cross-reference entries
Source: CVE Program / CVE List V5
Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.
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:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
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 6.14.0之前版本存在资源管理错误漏洞，该漏洞源于处理损坏的交叉引用表条目时，可能导致长时间运行，从而导致拒绝服务。
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

VendorProductAffected VersionsCPESubscribe
py-pdfpypdf < 6.14.0 -

II. Public POCs for CVE-2026-59937

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III. Intelligence Information for CVE-2026-59937

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Patches & Fixes for CVE-2026-59937 (2)

Vendor Advisories for CVE-2026-59937 (1)

Other References for CVE-2026-59937 (1)

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

CVE-2026-59938pypdf: Possible large memory usage for wrong image dimensions
CVE-2026-59936pypdf: Possible infinite loop for not terminated inline images
CVE-2026-59935pypdf: Possible infinite loop for not terminated inline images (ASCII85 and ASCIIHex filte

IV. Related Vulnerabilities

Same product: pypdf
Same vendor: py-pdf
Same weakness: CWE-400

V. Comments for CVE-2026-59937

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