py-pdf/pypdf · Security
Possible Infinite Loop when PdfWriter(clone_from) is used with a PDF
- GHSA ID
- GHSA-wjcc-cq79-p63f
- CVE ID
- CVE-2023-46250
- Severity
- medium
- Published
- Updated
- CVSS
- 5.1 · CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS v3
- 5.1 · CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
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.
CWEs
- CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')