CVSS 7.1 (high) · published 2026-10-29
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 products (NVD): py-pdf pypdf
Fixed in (NVD): 6.21.3
Weakness: CWE-400
Source: NVD CVE-2026-119206
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