HIGH 7.1 NVD
CVE-2026-119206
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
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.
References
- https://github.com/py-pdf/pypdf/commit/b891fef37000cd86baa6e9848a3387d080b3b03e
- https://github.com/py-pdf/pypdf/pull/4251
- https://github.com/py-pdf/pypdf/releases/tag/6.21.3
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphw
This high severity vulnerability with a CVSS score of 7.1 was published on 2026-10-29 via NVD.
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