medium4.8
CVE-2026-71870
pypdf: Possible large memory usage for large /ToUnicode streams
Impact
pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause large memory consumption when pypdf/_cmap.py function parse_bfrange parses unusually large source-code or destination-string tokens in a font /ToUnicode CMap 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-fp3f-mc75-235c
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3f-mc75-235c
- https://github.com/py-pdf/pypdf/pull/3944
- https://github.com/py-pdf/pypdf/commit/afba8080e19d29a3c256a742b340995e695b35aa
- https://github.com/py-pdf/pypdf/releases/tag/6.15.0