Inefficient Decoding

pypdf is vulnerable to inefficient decoding of ASCIIHexDecode streams. The vulnerability is due to an attacker being able to craft a PDF which leads to long runtimes, where accessing a stream uses the /ASCIIHexDecode filter and can be exploited by attackers to cause a denial of service...

GHSA-9M86-7PMV-2852 pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams

Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. Patches This has been fixed in pypdf==6.7.5. Workarounds If you cannot upgrade yet, consider applying the changes from PR 3666...