In short
- CVE-2026-113793 is a MEDIUM (CVSS 6.0) vulnerability affecting pypdf.
- Chance of exploitation in the next 30 days (EPSS): 0.47%, higher than 40.3% of all vulnerabilities.
- Fix: update to 6.20.1 or later.
| Package | Affected versions | Patched versions |
|---|
| pypdf PyPI | < 6.20.1
| 6.20.1
|
Description
Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires removing an object from a tree, for example an outline item.
Patches
This has been fixed in pypdf==6.20.1.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #4188.
NVD description
pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, removing an object from a crafted cyclic PDF tree, such as an outline item, can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.
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