GHSA-wjcc-cq79-p63f
Possible Infinite Loop when PdfWriter(clone_from) is used with a PDF
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop.
This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage.
That is, for example, the case when the pypdf-user manipulates an incoming malicious PDF e.g. by merging it with another PDF or by adding annotations.
### Patches
The issue was fixed with #2264
### Workarounds
If you cannot update your version of pypdf, you should modify `pypdf/generic/_data_structures.py` just like #2264 did.
References
External links from the advisory. They lead to third-party sites.