high7.5
CVE-2026-59937
pypdf: Possible long runtimes for repeated malformed cross-reference entries
Impact
pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. 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-55h5-xmcq-c37v
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v
- https://nvd.nist.gov/vuln/detail/CVE-2026-59937
- https://github.com/py-pdf/pypdf/pull/3887
- https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae
- https://github.com/py-pdf/pypdf/releases/tag/6.14.0