CVE-2026-84310
pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_doc_common.py _get_outline 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.
- Published Sep 1, 2026
- CVSS 4.8 medium
- 0.2% chance of exploitation in the next 30 days (EPSS)
- A fix is available