medium4.8
CVE-2026-71852
pypdf: Possible long runtimes/large memory usage for large CID font width ranges
Impact
pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause long runtimes and large memory consumption when pypdf/_font.py function Font._collect_cid_character_widths expands unusually large CID font /W width ranges or excessive width entries during text extraction. This issue is fixed in 6.15.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.15.0 | 6.15.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pypdf Project | Pypdf | before 6.15.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-fwg2-594c-jp42
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-fwg2-594c-jp42
- https://github.com/py-pdf/pypdf/pull/3946
- https://github.com/py-pdf/pypdf/commit/51cb6acf9e8a35b77e90b4d87d28fe3e1416d7d7
- https://github.com/py-pdf/pypdf/releases/tag/6.15.0