CVE-2026-82398

In pypdf (Python PDF library) prior to version 6.16.1, an attacker can craft a PDF that causes PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.

In pypdf (Python PDF library) prior to version 6.16.1, an attacker can craft a PDF that causes _get_outline in _doc_common.py to consume long runtimes and large amounts of memory when retrieving document outlines with large numbers of entries or deeply nested reused paths because the traversal lacked global entry-count and nesting-depth limits. This issue is fixed in version 6.16.1.

pypdf is a free and open-source pure-python PDF library. Prior to 6.16.0, an attacker can craft a PDF whose cyclic tree structure causes pypdf/generic/_data_structures.py TreeObject.insert_child to follow /Next links indefinitely when a writing code path inserts a child, producing an infinite loop. This issue is fixed in version 6.16.0.

pypdf prior to 6.15.0 is vulnerable to excessive memory consumption when parsing crafted PDFs, as the parse_bfrange function in pypdf/_cmap.py handles unusually large tokens in a font /ToUnicode CMap during text extraction. This issue is fixed in version 6.15.0.

A vulnerability in the pypdf library prior to version 6.15.0 allows long runtimes and high memory consumption when extracting text from a crafted PDF. The Font._collect_cid_character_widths function expands unusually large CID font /W width ranges or excessive width entries. The issue is fixed in version 6.15.0.

In pypdf library prior to version 6.14.1, a vulnerability was found causing an infinite loop when processing inline images in PDF page content streams. An attacker can craft a malicious PDF with a not terminated inline image, leading to a hang during text extraction.

The pypdf library prior to version 6.14.2 is vulnerable to a DoS attack due to an infinite loop when parsing PDF files. An attacker can craft a malicious PDF with a not terminated inline image using ASCII85 or ASCIIHex filters, causing the process to hang.

In the pypdf library prior to version 6.14.0, a vulnerability allows an attacker to craft a PDF with declared image size values much larger than the actual data, causing excessive memory usage during image parsing. This can be exploited for a denial-of-service (DoS) attack by exhausting memory resources.

In the pypdf library prior to version 6.14.0, a vulnerability allows an attacker to craft a PDF with multiple malformed cross-reference streams, causing long runtimes for recovering broken cross-reference table entries. This leads to excessive CPU usage and processing delays.

The pypdf library before version 6.13.3 contains a DoS vulnerability. A specially crafted PDF can cause excessive memory usage because the MAX_DECLARED_STREAM_LENGTH constant is sometimes ignored when parsing a content stream without a /Length value.