CVE-2026-27024
Infinite Loop Vulnerability in pypdf TreeObject Handling
Publication date: 2026-02-20
Last updated on: 2026-02-24
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| pypdf_project | pypdf | to 6.7.1 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-835 | The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in the pypdf library, a pure-python PDF library. Before version 6.7.1, an attacker could craft a specially designed PDF that triggers an infinite loop when the library accesses the children of a TreeObject, such as when processing outlines.
The issue is fixed in version 6.7.1 of pypdf.
How can this vulnerability impact me? :
Exploiting this vulnerability can cause the pypdf library to enter an infinite loop, potentially leading to denial of service conditions in applications that use this library to process PDF files.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade the pypdf library to version 6.7.1 or later, where the issue has been fixed.