py-pdf pypdf up to 6.10.1 size memory allocation

Summaryinfo

A vulnerability marked as problematic has been reported in py-pdf pypdf up to 6.10.1. The impacted element is an unknown function. The manipulation of the argument size leads to memory allocation. This vulnerability is traded as CVE-2026-41314. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in py-pdf pypdf up to 6.10.1 and classified as problematic. This issue affects an unknown code. The manipulation of the argument size with an unknown input leads to a memory allocation vulnerability. Using CWE to declare the problem leads to CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. Impacted is availability. The summary by CVE is:

pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to the RAM being exhausted. This requires accessing an image using `/FlateDecode` with large size values. This has been fixed in pypdf 6.10.2. As a workaround, one may apply the changes from the patch manually.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-41314 since 04/20/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 316727 (openSUSE 16 Security Update : python-PyPDF2 (openSUSE-SU-2026:20794-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.10.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch ac734dab4eef92bcce50d503949b4d9887d89f11 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (316727). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• py-pdf

Name

• pypdf

Version

• 6.10.0
• 6.10.1

License

• open-source

Website

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

CPE 2.3info

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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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