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...

CVE-2026-59937

A flaw was found in pypdf, a pure-python PDF library. A remote attacker could exploit this vulnerability by crafting a malicious PDF file containing repeated malformed cross-reference streams. This could cause the pypdf library to spend excessive time recovering broken cross-reference table...

CVE-2026-54531

A flaw was found in pypdf before 6.13.0. A crafted PDF with outlines can trigger an infinite loop when merged into a PdfWriter, causing denial of service...

CVE-2026-49460

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /FlateDecode filter with a PNG predictor. This vulnerability is fixed in 6.12.2...

CVE-2026-48156 pypdf: Possible long runtimes for zero-only width values in cross-reference streams

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W 0 0 0 values and large /Size values. This vulnerability is fixed in 6.12.0...

CVE-2026-41313

A flaw was found in pypdf. An attacker can craft a malicious PDF file with a large trailer /Size value. When this PDF is loaded in incremental mode, it can lead to excessively long processing times, resulting in a Denial of Service DoS for the application or system processing the file. Mitigation...

CVE-2026-41168

A flaw was found in pypdf. An attacker can craft a malicious PDF file containing oversized cross-reference streams or object streams. Processing such a file can lead to excessively long runtimes, resulting in a Denial of Service DoS for applications using the pypdf library. Mitigation Mitigation...

SUSE CVE-2026-41313

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 long runtimes. This requires loading a PDF with a large trailer /Size value in incremental mode. This has been fixed in pypdf 6.10.2. As...

CVE-2026-27628

A flaw was found in pypdf. Processing a specially crafted PDF document, specifically with circular /Prev references in the cross-reference xref chain, can cause an infinite loop and a high consumption of CPU, resulting in a denial of service. Mitigation Mitigation for this issue is either not...