pypdf has inefficient decoding of array-based streams

ImpactAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes and/or large memory usage. This requires accessing an array-based stream with lots of entries. PatchesThis has been fixed in pypdf==6.9.1. WorkaroundsIf you cannot upgrade yet, consider applying the changes...

PYSEC-2026-3023 pypdf has inefficient decoding of array-based streams

Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and/or large memory usage. This requires accessing an array-based stream with lots of entries. Patches This has been fixed in pypdf==6.9.1. Workarounds If you cannot upgrade yet, consider applying the...

PT-2026-59645

Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and/or large memory usage. This requires accessing an array-based stream with lots of entries. Patches This has been fixed in pypdf==6.9.1. Workarounds If you cannot upgrade yet, consider applying the...

openSUSE 16 Security Update : python-PyPDF2 (openSUSE-SU-2026:20430-1)

The remote openSUSE 16 host has a package installed that is affected by a vulnerability as referenced in the openSUSE- SU-2026:20430-1 advisory. Changes in python-PyPDF2: - CVE-2026-33123: Fixed excessive resource consumption when processing specially crafted PDF due to inefficient decoding of...

Denial Of Service

pypdf is vulnerable to Denial of Service. The vulnerability is due to inefficient decoding of array-based streams, where accessing an array-based stream with many entries leads to long runtimes and large memory usage, and attackers can exploit it by crafting a malicious PDF with a large array-bas...

CVE-2026-33123

pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1...

CVE-2026-33123: Uncontrolled Resource Consumption

pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1...

pypdf has inefficient decoding of array-based streams

Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and/or large memory usage. This requires accessing an array-based stream with lots of entries. Patches This has been fixed in pypdf==6.9.1. Workarounds If you cannot upgrade yet, consider applying the...

Inefficient Algorithmic Complexity

Overview pypdf is an A pure-python PDF library capable of splitting, merging, cropping, and transforming PDF files Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity in the decoding process of array-based streams. An attacker can cause excessive resource...

GHSA-QPXP-75PX-XJCP pypdf has inefficient decoding of array-based streams

Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and/or large memory usage. This requires accessing an array-based stream with lots of entries. Patches This has been fixed in pypdf==6.9.1. Workarounds If you cannot upgrade yet, consider applying the...

EUVD-2026-3200

A vulnerability was found in birkir prime up to 0.4.0.beta.0. The impacted element is an unknown function of the file /graphql of the component GraphQL Array Based Query Batch Handler. The manipulation results in denial of service. The attack can be executed remotely. The exploit has been made...

CVE-2026-1173: Improper Resource Shutdown or Release

A vulnerability was found in birkir prime up to 0.4.0.beta.0. The impacted element is an unknown function of the file /graphql of the component GraphQL Array Based Query Batch Handler. The manipulation results in denial of service. The attack can be executed remotely. The exploit has been made...