Denial Of Service (DoS)

pypdf is vulnerable to Denial Of Service. The vulnerability is due to parsing a PDF content stream with an inflated Length value, where the parser allocates memory based on the declared length without verifying the actual data size, and an attacker can craft a PDF with a large /Length field to...

CVE-2026-31826 pypdf: manipulated stream length values can exhaust RAM

pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. Thi...

CVE-2026-31826 pypdf: manipulated stream length values can exhaust RAM

pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. Thi...

CVE-2025-66019

CVE-2025-66019 affects the Python PDF library pypdf up to version 6.3.x. Reporter data from multiple sources state that parsing a page content stream using the LZWDecode filter can cause memory usage to balloon to as much as 1 GB per stream, leading to potential denial of service on affected pars...

CVE-2025-62708 pypdf manipulated LZWDecode streams can exhaust RAM

pypdf is a free and open-source pure-python PDF library. Prior to version 6.1.3, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream of a page using the LZWDecode filter. This has been fixed in pypdf version 6.1.3...

CoreGraphics Information Disclosure - CVE-2014-4378

This article explores the exploitability of MobileSafari on IOS 7.1.x. Using a crafted PDF file as an HTML image makes it possible to leak information about the memory layout to the browser Javascript interpreter. Apple CoreGraphics library fails to validate input when parsing the colorspace...