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CVE-2026-113791— pypdf: Possible large memory usage when parsing content streams

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 6.21.0 版本之前，攻击者可以构造一个包含内容流的 PDF 文件，该流中包含大量微小操作，导致解析过程消耗大量内存。此问题已在 6.21.0 版本中修复。

CVSS 6.0 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
py-pdf pypdf < 6.21.0 affected
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I. Basic Information for CVE-2026-113791

Vulnerability Information
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Vulnerability Title
pypdf: Possible large memory usage when parsing content streams
Source: CVE Program / CVE List V5
Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF containing a content stream with many small operations, causing parsing to consume large amounts of memory. This issue is fixed in version 6.21.0.
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
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
py-pdf pypdf < 6.21.0 -

II. Public POCs for CVE-2026-113791

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III. Intelligence Information for CVE-2026-113791

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Other References for CVE-2026-113791 (4)

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

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-2026-113793 6.0 MEDIUM pypdf: Possible infinite loop when removing tree items
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-400

V. Comments for CVE-2026-113791

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