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CVE-2026-113793— pypdf: Possible infinite loop when removing tree items

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 是一个免费且开源的纯 Python PDF 库。在 6.20.1 版本之前，从精心构造的循环 PDF 树（例如大纲条目）中移除对象时，可能导致无限循环并阻塞当前进程。该问题已在 6.20.1 版本中修复。

CVSS 6.0 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
py-pdf pypdf < 6.20.1 affected
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I. Basic Information for CVE-2026-113793

Vulnerability Information
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Vulnerability Title
pypdf: Possible infinite loop when removing tree items
Source: CVE Program / CVE List V5
Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, removing an object from a crafted cyclic PDF tree, such as an outline item, can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
py-pdf pypdf < 6.20.1 -

II. Public POCs for CVE-2026-113793

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III. Intelligence Information for CVE-2026-113793

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Patches & Fixes for CVE-2026-113793 (2)

Vendor Advisories for CVE-2026-113793 (1)

Vendor Pages for CVE-2026-113793 (1)

Same Patch Batch · py-pdf · 2026-10-21 · 8 CVEs total

CVE-2026-113791 6.0 MEDIUM pypdf: Possible large memory usage when parsing content streams
CVE-2026-113790 6.0 MEDIUM pypdf: Possible large memory usage when parsing arrays and dictionaries
CVE-2026-113789 6.0 MEDIUM pypdf: Possible long runtimes/large memory usage when retrieving form fields
CVE-2026-113794 6.0 MEDIUM pypdf: Possible infinite loop when hitting EOF in standard xref table
CVE-2026-113792 6.0 MEDIUM pypdf: Possible infinite loop in PdfWriter.find_outline_item
CVE-2026-113795 6.0 MEDIUM pypdf: Possible large memory usage for streams with multiple filters
CVE-2026-113786 2.3 LOW pypdf: Unvalidated JPEG image data loading

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-113793

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