CVE-2026-102999: CWE-400: Uncontrolled Resource Consumption in py-pdf pypdf
CVE-2026-102999 is a high-severity vulnerability in the pypdf library prior to version 6.19.0. It involves uncontrolled resource consumption caused by reparsing the full attachment list repeatedly when processing crafted PDFs with many embedded files. This leads to excessive CPU usage and long runtimes during embedded-file mapping access. The issue is fixed in pypdf version 6.19.0.
AI Analysis
Technical Summary
The pypdf library versions before 6.19.0 contain a resource consumption vulnerability (CWE-400) in the dictionary-based attachments API located in pypdf/_doc_common.py. When a crafted PDF with many embedded files is processed, the API reparses the entire attachment list for each content lookup, causing repeated work and significantly increased processing time. This flaw was addressed and fixed in version 6.19.0 of pypdf.
Potential Impact
An attacker can craft a PDF with numerous embedded files that triggers excessive CPU usage and long processing times when an application uses the attachments API in vulnerable pypdf versions. This can degrade application performance or cause denial of service due to resource exhaustion. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade to pypdf version 6.19.0 or later, where this uncontrolled resource consumption vulnerability has been fixed. No other mitigation is required as the fix addresses the root cause.
CVE-2026-102999: CWE-400: Uncontrolled Resource Consumption in py-pdf pypdf
Description
CVE-2026-102999 is a high-severity vulnerability in the pypdf library prior to version 6.19.0. It involves uncontrolled resource consumption caused by reparsing the full attachment list repeatedly when processing crafted PDFs with many embedded files. This leads to excessive CPU usage and long runtimes during embedded-file mapping access. The issue is fixed in pypdf version 6.19.0.
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 pypdf library versions before 6.19.0 contain a resource consumption vulnerability (CWE-400) in the dictionary-based attachments API located in pypdf/_doc_common.py. When a crafted PDF with many embedded files is processed, the API reparses the entire attachment list for each content lookup, causing repeated work and significantly increased processing time. This flaw was addressed and fixed in version 6.19.0 of pypdf.
Potential Impact
An attacker can craft a PDF with numerous embedded files that triggers excessive CPU usage and long processing times when an application uses the attachments API in vulnerable pypdf versions. This can degrade application performance or cause denial of service due to resource exhaustion. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade to pypdf version 6.19.0 or later, where this uncontrolled resource consumption vulnerability has been fixed. No other mitigation is required as the fix addresses the root cause.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-29T20:46:08.335Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abd72552a4e24523d8ec0ee
Added to database: 09/30/2026, 20:34:29 UTC
Last enriched: 09/30/2026, 20:48:00 UTC
Last updated: 10/01/2026, 04:54:05 UTC
Views: 9
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