CVE-2026-102993: CWE-400: Uncontrolled Resource Consumption in py-pdf pypdf
CVE-2026-102993 is a high-severity vulnerability in the py-pdf pypdf library prior to version 6.17.0. It involves uncontrolled resource consumption caused by crafted PDF files with large Roman page-label values. This triggers the generation of excessively large numeral strings in pypdf/_page_labels.py, leading to high memory usage and potential application unavailability. The issue is fixed in version 6.17.0.
AI Analysis
Technical Summary
The vulnerability in pypdf versions before 6.17.0 arises from the handling of Roman page-label values in PDF documents. Maliciously crafted PDFs can specify unusually large Roman numerals for page labels, causing the _page_labels.py module to generate very large numeral strings. This results in excessive memory consumption, which can degrade performance or cause denial of service by making the application unavailable. The flaw is categorized under CWE-400 (Uncontrolled Resource Consumption) and CWE-770. The vendor fixed this issue in pypdf version 6.17.0.
Potential Impact
Exploitation of this vulnerability can cause an application using pypdf to consume excessive memory resources when processing crafted PDFs with large Roman page-label values. This can lead to application slowdown or unavailability, effectively a denial-of-service condition. There is no indication of privilege escalation or data compromise from the provided data.
Mitigation Recommendations
Upgrade pypdf to version 6.17.0 or later, where this vulnerability is fixed. No other mitigation is indicated or required according to the vendor advisory.
CVE-2026-102993: CWE-400: Uncontrolled Resource Consumption in py-pdf pypdf
Description
CVE-2026-102993 is a high-severity vulnerability in the py-pdf pypdf library prior to version 6.17.0. It involves uncontrolled resource consumption caused by crafted PDF files with large Roman page-label values. This triggers the generation of excessively large numeral strings in pypdf/_page_labels.py, leading to high memory usage and potential application unavailability. The issue is fixed in version 6.17.0.
CVSS v4.0
Score 8.7high
Affected software
py-pdf
pypdf
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in pypdf versions before 6.17.0 arises from the handling of Roman page-label values in PDF documents. Maliciously crafted PDFs can specify unusually large Roman numerals for page labels, causing the _page_labels.py module to generate very large numeral strings. This results in excessive memory consumption, which can degrade performance or cause denial of service by making the application unavailable. The flaw is categorized under CWE-400 (Uncontrolled Resource Consumption) and CWE-770. The vendor fixed this issue in pypdf version 6.17.0.
Potential Impact
Exploitation of this vulnerability can cause an application using pypdf to consume excessive memory resources when processing crafted PDFs with large Roman page-label values. This can lead to application slowdown or unavailability, effectively a denial-of-service condition. There is no indication of privilege escalation or data compromise from the provided data.
Mitigation Recommendations
Upgrade pypdf to version 6.17.0 or later, where this vulnerability is fixed. No other mitigation is indicated or required according to the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-29T20:46:08.334Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abd6b1e2a4e24523d869f90
Added to database: 09/30/2026, 20:03:42 UTC
Last enriched: 09/30/2026, 20:18:21 UTC
Last updated: 10/01/2026, 03:50:42 UTC
Views: 10
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