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 consume excessive time and memory when an application accesses the page count of a crafted encrypted PDF whose page tree declares a forged /Count value. Even after successful decryption, page-count retrieval trusts the unvalidated declared count instead of walking the page tree, allowing the attacker-controlled value to drive excessive work and memory use. 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-2026-119208
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