medium5.3
CVE-2026-59938
pypdf: Possible large memory usage for wrong image dimensions
Impact
pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with declared image size values that are much too large compared to the actual data, causing large memory usage in pypdf image parsing. This issue is fixed in version 6.14.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.14.0 | 6.14.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pypdf Project | Pypdf | before 6.14.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-5qjq-93h5-hrgp
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-5qjq-93h5-hrgp
- https://nvd.nist.gov/vuln/detail/CVE-2026-59938
- https://github.com/py-pdf/pypdf/pull/3888
- https://github.com/py-pdf/pypdf/commit/c64583be16b8e8763d8777075f8ecbf382014b7a
- https://github.com/py-pdf/pypdf/releases/tag/6.14.0