high7.1
CVE-2026-119206
pypdf has possible long runtimes when retrieving page labels
Impact
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can take excessive time to retrieve page labels from a crafted PDF containing a flat page-label number tree with many ranges. The page_labels property resolves each page independently and repeatedly scans the same /Nums array from the beginning, causing work to grow with both the page count and the number of label ranges. This issue is fixed in version 6.21.3.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.21.3 | 6.21.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Py-Pdf | Pypdf | before 6.21.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-42gh-23hr-vphw
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphw
- https://nvd.nist.gov/vuln/detail/CVE-2026-119206
- https://github.com/py-pdf/pypdf/pull/4251
- https://github.com/py-pdf/pypdf/commit/b891fef37000cd86baa6e9848a3387d080b3b03e
- https://github.com/py-pdf/pypdf/releases/tag/6.21.3