pypdf is an open source, pure-python PDF library. In affected versions an attacker may craft a PDF which leads to an infinite loop if __parse_content_stream is executed. That is, for example, the case if the user extracted text from such a PDF. This issue was introduced in pull request #969 and resolved in pull request #1828. Users are advised to upgrade. Users unable to upgrade may modify the line while peek not in (br, bn) in pypdf/generic/_data_structures.py to while peek not in (br, bn, b).
Weakness
The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Pypdf | Pypdf_project | * | 3.9.0 (excluding) |
| Pypdf2 | Pypdf2_project | 2.2.0 (including) | * |
| Pypdf | Ubuntu | bionic | * |
| Pypdf | Ubuntu | lunar | * |
| Pypdf | Ubuntu | mantic | * |
| Pypdf | Ubuntu | oracular | * |
| Pypdf | Ubuntu | plucky | * |
| Pypdf | Ubuntu | trusty | * |
| Pypdf | Ubuntu | xenial | * |
References
- https://github.com/py-pdf/pypdf/pull/1828
- https://github.com/py-pdf/pypdf/pull/969
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-4vvm-4w3v-6mr8
- https://github.com/py-pdf/pypdf/pull/1828
- https://github.com/py-pdf/pypdf/pull/969
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-4vvm-4w3v-6mr8