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CVE-2026-102993— pypdf: Possible large memory usage when retrieving Roman page labels

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 6.17.0 版本之前，一个经过恶意构造的 PDF 文件可以提供异常巨大的罗马数字页码标签值，导致 pypdf/_page_labels.py 在应用程序获取文档页码标签时生成过长的数字字符串，从而消耗大量内存，并可能导致应用程序不可用。该问题已在 6.17.0 版本中修复。

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-102993

Vulnerability Information
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Vulnerability Title
pypdf: Possible large memory usage when retrieving Roman page labels
Source: CVE Program / CVE List V5
Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.17.0, a crafted PDF can provide unusually large Roman page-label values that cause pypdf/_page_labels.py to generate excessively large numeral strings when an application retrieves document page labels, consuming large amounts of memory and potentially making the application unavailable. This issue is fixed in version 6.17.0.
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: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 < 6.17.0 -

II. Public POCs for CVE-2026-102993

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III. Intelligence Information for CVE-2026-102993

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Patches & Fixes for CVE-2026-102993 (1)

Vendor Advisories for CVE-2026-102993 (1)

Vendor Pages for CVE-2026-102993 (1)

Same Patch Batch · py-pdf · 2026-09-30 · 8 CVEs total

CVE-2026-102998 8.7 HIGH pypdf: Possible long runtimes when generating appearance streams
CVE-2026-102995 8.7 HIGH pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)
CVE-2026-102997 8.7 HIGH pypdf: Possible long runtimes for partially malformed FlateDecode streams (Follow-up)
CVE-2026-102994 8.7 HIGH pypdf: Possible long runtimes/large memory usage when parsing indirect objects
CVE-2026-102996 8.7 HIGH pypdf: Possible large memory usage when parsing font data
CVE-2026-102999 8.7 HIGH pypdf: Possible long runtimes with large amount of embedded files
CVE-2026-103000 8.7 HIGH pypdf: Possible large memory usage when retrieving alphabetical page labels

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-102993

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