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CVE-2026-48155— pypdf: Possible large memory usage for large offsets for layout mode text

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 6.12.0之前版本存在资源管理错误漏洞，该漏洞源于在布局模式下提取文本时使用大字符偏移量，可能导致攻击者制作PDF导致大量内存使用。

AI Predicted 5.3 Difficulty: Easy EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
py-pdf pypdf < 6.12.0 affected
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I. Basic Information for CVE-2026-48155

Vulnerability Information
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Vulnerability Title
pypdf: Possible large memory usage for large offsets for layout mode text
Source: CVE Program / CVE List V5
Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting text in layout mode with large character offsets. This vulnerability is fixed in 6.12.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/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
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 6.12.0之前版本存在资源管理错误漏洞，该漏洞源于在布局模式下提取文本时使用大字符偏移量，可能导致攻击者制作PDF导致大量内存使用。
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 < 6.12.0 -

II. Public POCs for CVE-2026-48155

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III. Intelligence Information for CVE-2026-48155

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Patches & Fixes for CVE-2026-48155 (1)

Vendor Advisories for CVE-2026-48155 (1)

Vendor Pages for CVE-2026-48155 (1)

Same Patch Batch · py-pdf · 2026-05-28 · 3 CVEs total

CVE-2026-48156 pypdf: Possible long runtimes for zero-only width values in cross-reference streams
CVE-2026-48735 pypdf: Manipulated XMP metadata streams can exhaust RAM

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-48155

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