PYSEC-2026-3027 pypdf: Manipulated FlateDecode XFA streams can exhaust RAM

Impact An attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the xfa property of a reader or writer and the corresponding stream being compressed using /FlateDecode. Patches This has been fixed in pypdf==6.7.3. Workarounds If...

PYSEC-2026-1831 pypdf can exhaust RAM via manipulated LZWDecode streams

Impact 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. Patches This has been fixed in pypdf==6.1.3. Workarounds If you cannot upgrade yet, consider applying the changes from P...

DEBIAN-CVE-2026-41312

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 a stream compressed using /FlateDecode with a /Predictor unequal 1 and large predictor...

EUVD-2026-8791

pypdf: Manipulated FlateDecode XFA streams can exhaust RAM...

pypdf 安全漏洞

pypdf is an open-source, free Python library for handling PDF files. It allows for splitting, merging, cropping, and converting pages within PDF files. Prior to version 6.7.1, pypdf had a security vulnerability that stemmed from processing format-corrupted /FlateDecode streams, which could lead t...

Uncontrolled Memory Allocation

pypdf is vulnerable to uncontrolled memory allocation. The vulnerability is due to improper handling of LZWDecode streams, which allows an attacker to craft a malicious PDF that causes excessive memory consumption up to 1 GB per stream during content parsing...

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...

CVE-2025-55197 pypdf's Manipulated FlateDecode streams can exhaust RAM

pypdf is a free and open-source pure-python PDF library. Prior to version 6.0.0, an attacker can craft a PDF which leads to the RAM being exhausted. This requires just reading the file if a series of FlateDecode filters is used on a malicious cross-reference stream. Other content streams are...