CVE-2026-113790: CWE-400: Uncontrolled Resource Consumption in py-pdf pypdf
Description
CVE-2026-113790 is a vulnerability in the pypdf library prior to version 6.21.0 where an attacker can craft a PDF with large arrays or dictionaries, causing excessive memory consumption during parsing. This uncontrolled resource consumption can lead to denial of service conditions. The issue is fixed in version 6.21.0.
CVSS v4.0
Score 6.0medium
Affected software
py-pdf
pypdf
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The pypdf library, a pure-python PDF processing tool, suffers from an uncontrolled resource consumption vulnerability (CWE-400) in versions before 6.21.0. An attacker can create a malicious PDF containing arrays or dictionaries with a large number of elements, which causes the parser to consume excessive memory resources. This flaw can degrade system performance or cause denial of service. The vulnerability has been addressed and fixed in pypdf version 6.21.0.
Potential Impact
Exploitation of this vulnerability can cause the pypdf parser to consume large amounts of memory, potentially leading to denial of service by exhausting system resources. There is no indication of code execution or data disclosure. The CVSS 4.0 score of 6.0 reflects a medium severity impact primarily due to resource exhaustion.
Mitigation Recommendations
Upgrade to pypdf version 6.21.0 or later, where this vulnerability has been fixed. No other specific mitigations are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-20T17:39:41.372Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad8e1cc4d27ba8daabfb4f0
Added to database: 10/21/2026, 16:01:16 UTC
Last enriched: 10/21/2026, 16:15:34 UTC
Last updated: 10/21/2026, 16:16:22 UTC
Views: 5
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