high7.1
CVE-2026-115580
pypdf: Possible long runtimes for large xref table header limits
Impact
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an attacker can craft a PDF with a standard cross-reference table whose declared entry count exceeds what the file can contain, causing excessive processing and long runtimes when the file is opened. This issue is fixed in version 6.21.2.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.21.2 | 6.21.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-gmh7-3g9r-mjh5
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-gmh7-3g9r-mjh5
- https://github.com/py-pdf/pypdf/pull/4239
- https://github.com/py-pdf/pypdf/commit/a3061e34b169d34478d520f5f049c53cfb1482b2
- https://github.com/py-pdf/pypdf/releases/tag/6.21.2