EUVD-2026-54600

pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause long runtimes and large memory consumption when pypdf/font.py function Font.collectcidcharacterwidths expands unusually large CID font /W width ranges or excessive width entries during text extractio...

pypdf: Possible large memory usage for wrong image dimensions

ImpactAn attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires loading images where the declared size values are much too large compared to the actual data. PatchesThis has been fixed in pypdf==6.14.0. WorkaroundsIf you cannot upgrade yet, consider...

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-2026-33699

A flaw was found in pypdf. An attacker can craft a malicious PDF file that, when processed by pypdf in non-strict mode, triggers an infinite loop. This vulnerability can lead to a Denial of Service DoS by consuming excessive system resources, making the application unresponsive. Mitigation To...

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...