py-pdf pypdf up to 6.21.2 resource consumption

Summaryinfo

A vulnerability, which was classified as problematic, has been found in py-pdf pypdf up to 6.21.2. The impacted element is an unknown function. The manipulation leads to resource consumption. This vulnerability is referenced as CVE-2026-119208. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in py-pdf pypdf up to 6.21.2 and classified as problematic. This issue affects an unknown functionality. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-119208 since 10/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 6.21.3 eliminates this vulnerability.

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Productinfo

Vendor

• py-pdf

Name

• pypdf

Version

• 6.21.0
• 6.21.1
• 6.21.2

Website

• Product: https://github.com/py-pdf/pypdf/

CPE 2.3info

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CPE 2.2info

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